[Keymap] Add issmirnov {user, ergodox, levinson} files. (#7239)

* Add issmirnov {user, ergodox, levinson} files.

There are enough interesting QMK tricks in these layouts that it seems
worth it to share with the broader community. Big thanks to Drashna for
inspiration, as well as all the wonderful creators of QMK documentation.

Some highlights:
- Common layout shared between levinson and ergodox_ez
- TAP_TOG macro for fast layer switching
- Autogenerated keymaps ascii art with git hooks

I will do my best to do periodic rolls here, but the source of truth
will always be https://github.com/issmirnov/qmk-keebs

* Incorporate review feedback.

- Remove CLEAR_EEPROM in favor of built in EEP_RST
- Remove custom handlers for audio on bootup and shutdown
- Remove plethora of unneeded includes
- Remove deprecated and dupliated config options

HUGE thanks to drashna for the review!

* Apply suggestions from code review

Huge thanks to drashna@ for a very thorough review and the very useful suggestions.

Co-Authored-By: Drashna Jaelre <drashna@live.com>

* Remove unclear optimization

This was an artifact from some other keymap I saw.

7 files changed, 418 insertions, 0 deletions

diff --git a/layouts/community/ergodox/issmirnov/README.md b/layouts/community/ergodox/issmirnov/README.md
new file mode 100644
index 000000000..564edfe31
--- /dev/null
+++ b/layouts/community/ergodox/issmirnov/README.md
@@ -0,0 +1,49 @@
+# Ivan's Ergodox Config
+
+
+## Details about the layout
+
+- Shift and Cmd are One Shot Modifiers, so tapping them once will apply them to the next key. When tapped twice they will lock, until tapped again to clear.
+- When switching to other layers, any stuck modifiers are cleared in order to avoid unintended key combos
+- There are a few leader key combinations. Right now, `KC_LEAD` + `s` will open my wiki homepage.
+- All transparent keys have been replaced with noops to avoid layer bleeding.
+
+## Initial Setup
+
+### QMK
+
+```
+brew tap osx-cross/avr
+brew tap PX4/homebrew-px4
+brew update
+brew install avr-gcc
+brew install dfu-programmer
+brew install gcc-arm-none-eabi
+brew install avrdude
+
+git clone https://github.com/qmk/qmk_firmware.git
+git clone https://github.com/issmirnov/ergodox-layout.git \
+            layouts/community/ergodox/ismirnov
+```
+
+### Teensy utils
+
+Download and add both of these to $PATH
+
+- [hid_listen](https://www.pjrc.com/teensy/hid_listen.html)
+- [teensy loader cli](https://www.pjrc.com/teensy/loader_cli.html)
+
+## Flashing
+
+```
+make ergodox_ez:ismirnov
+teensy_loader_cli -mmcu=atmega32u4 -w -v ergodox_ez_ismirnov.hex
+
+# or just
+make ergodox_ez:ismirnov:flash
+```
+
+## Gotchas
+
+- If you get error: `dyld: Library not loaded: /usr/local/opt/isl/lib/libisl.15.dylib` then do `brew reinstall avr-gcc`
+- If `hid_listen` just prints out a ton of dots, update makefile with `CONSOLE_ENABLE = yes`
diff --git a/layouts/community/ergodox/issmirnov/asci-keymap.txt b/layouts/community/ergodox/issmirnov/asci-keymap.txt
new file mode 100644
index 000000000..9b023f664
--- /dev/null
+++ b/layouts/community/ergodox/issmirnov/asci-keymap.txt
@@ -0,0 +1,95 @@
+                                              Qwerty                                              
+,--------------------------------------------.      ,--------------------------------------------.
+| Escape |  1  |  2  |  3  |  4  |  5  |  !  |      |  =  |  6  |  7  |  8  |  9  |  0  | Escape |
+|--------+-----+-----+-----+-----+-----+-----|      |-----+-----+-----+-----+-----+-----+--------|
+|Lctl(Spa|  Q  |  W  |  E  |  R  |  T  |  *  |      |  +  |  Y  |  U  |  I  |  O  |  P  |Lgui(Spa|
+|--------+-----+-----+-----+-----+-----|     |      |     |-----+-----+-----+-----+-----+--------|
+|  Tab   |  A  |  S  |  D  |  F  |  G  |-----|      |-----|  H  |  J  |  K  |  L  |TapTo|Mo(Navi)|
+|--------+-----+-----+-----+-----+-----|  /  |      |  -  |-----+-----+-----+-----+-----+--------|
+|Osm(ModL|  Z  |  X  |  C  |  V  |  B  |     |      |     |  N  |  M  |  .  |Comma|Tg(Nu|   '    |
+`--------+-----+-----+-----+-----+-----------'      `-----------+-----+-----+-----+-----+--------'
+   |Ctrl |Lsft(|Lsft(| Alt | Mod |                              |Escap|  :  |  %  |     |Lgui(|
+   `-----------------------------' ,-----------.  ,-----------. `-----------------------------'
+                                   |     |     |  |  ←  |  →  |
+                             ,-----|-----|-----|  |-----+-----+-----.
+                             |     |     |     |  |  ↑  |     |     |
+                             |  ⎵  |  ⌫  |-----|  |-----| Tab |Enter|
+                             |     |     | Del |  |  ↓  |     |     |
+                             `-----------------'  `-----------------'
+
+                                               Symb                                               
+,--------------------------------------------.      ,--------------------------------------------.
+| Escape | F1  | F2  | F3  | F4  | F5  | F6  |      | F7  | F8  | F9  | F10 | F11 | F12 |        |
+|--------+-----+-----+-----+-----+-----+-----|      |-----+-----+-----+-----+-----+-----+--------|
+|        |  -  |  @  |  {  |  }  |  `  |  *  |      |  +  |  *  |  !  |  |  |  %  |  +  |Mo(Navi)|
+|--------+-----+-----+-----+-----+-----|     |      |     |-----+-----+-----+-----+-----+--------|
+|  Tab   |  ^  |  _  |  (  |  )  |  $  |-----|      |-----|  #  |  =  |  :  |  ;  |TapTo|  Dquo  |
+|--------+-----+-----+-----+-----+-----|  /  |      |  -  |-----+-----+-----+-----+-----+--------|
+| Lshift |  <  |  >  |  [  |  ]  |  ~  |     |      |     |  &  |  ?  |  /  |  \  |Tg(Nu|   '    |
+`--------+-----+-----+-----+-----+-----------'      `-----------+-----+-----+-----+-----+--------'
+   |Ctrl |Lsft(|Lsft(| Alt |WkspL|                              |Escap|  :  |  %  |     |     |
+   `-----------------------------' ,-----------.  ,-----------. `-----------------------------'
+                                   |     |     |  |  ←  |  →  |
+                             ,-----|-----|-----|  |-----+-----+-----.
+                             |     |     |     |  |  ↑  |     |     |
+                             |WkspR|  ⌫  |-----|  |-----| Tab |Enter|
+                             |     |     | Del |  |  ↓  |     |     |
+                             `-----------------'  `-----------------'
+
+                                               Nump                                               
+,--------------------------------------------.      ,--------------------------------------------.
+|        |     |     |     |     |     |     |      |  =  |     |     |     |     |     | Reset  |
+|--------+-----+-----+-----+-----+-----+-----|      |-----+-----+-----+-----+-----+-----+--------|
+|        | No  | No  |Lgui(|     |     |  *  |      |  +  |  ,  |  7  |  8  |  9  |     |        |
+|--------+-----+-----+-----+-----+-----|     |      |     |-----+-----+-----+-----+-----+--------|
+|  Tab   |     |Lgui(|Lgui(|Lgui(|     |-----|      |-----|  0  |  4  |  5  |  6  |To(Sy|        |
+|--------+-----+-----+-----+-----+-----|  /  |      |  -  |-----+-----+-----+-----+-----+--------|
+|        |     |     |     |Audio|Audio|     |      |     |  .  |  1  |  2  |  3  |To(Qw|        |
+`--------+-----+-----+-----+-----+-----------'      `-----------+-----+-----+-----+-----+--------'
+   |To(0)|     |     |     |     |                              |  0  |     |     |To(3)|     |
+   `-----------------------------' ,-----------.  ,-----------. `-----------------------------'
+                                   |     |     |  |  ←  |  →  |
+                             ,-----|-----|-----|  |-----+-----+-----.
+                             |     |     |     |  |  ↑  |     |     |
+                             |  ⎵  |  ⌫  |-----|  |-----| Alt |Shift|
+                             |     |     | Del |  |  ↓  |     |     |
+                             `-----------------'  `-----------------'
+
+                                            Overwatch                                             
+,--------------------------------------------.      ,--------------------------------------------.
+| Escape |  1  |  2  |  3  |  4  |  5  |To(0)|      |     |     |     |     |     |     |        |
+|--------+-----+-----+-----+-----+-----+-----|      |-----+-----+-----+-----+-----+-----+--------|
+|  Tab   |  Q  |  W  |  E  |  R  |  T  |     |      |     |     |     |     |     |     |        |
+|--------+-----+-----+-----+-----+-----|     |      |     |-----+-----+-----+-----+-----+--------|
+|  Ctrl  |  A  |  S  |  D  |  F  |  P  |-----|      |-----|     |     |     |     |     |        |
+|--------+-----+-----+-----+-----+-----|     |      |     |-----+-----+-----+-----+-----+--------|
+| Lshift |  Z  |  X  |  C  |  V  |Grave|     |      |     |     |     |     |     |     |        |
+`--------+-----+-----+-----+-----+-----------'      `-----------+-----+-----+-----+-----+--------'
+   |Ctrl | F9  |Pscre|  H  |  R  |                              |     |     |     |     |     |
+   `-----------------------------' ,-----------.  ,-----------. `-----------------------------'
+                                   |     |     |  |     |     |
+                             ,-----|-----|-----|  |-----+-----+-----.
+                             |     |     |     |  |     |     |     |
+                             |  ⎵  |     |-----|  |-----|     |     |
+                             |     |     |     |  |     |     |     |
+                             `-----------------'  `-----------------'
+
+                                               Navi                                               
+,--------------------------------------------.      ,--------------------------------------------.
+| Escape |  1  |  2  |  3  |  4  |  5  |  6  |      |     |     |     |     |     |     |        |
+|--------+-----+-----+-----+-----+-----+-----|      |-----+-----+-----+-----+-----+-----+--------|
+|        |     |     |  ↑  |     |     |     |      |     |     |     |     |     |     |        |
+|--------+-----+-----+-----+-----+-----|     |      |     |-----+-----+-----+-----+-----+--------|
+|        |     |  ←  |  ↓  |  →  |     |-----|      |-----|     |Ctrl |     |     |     |        |
+|--------+-----+-----+-----+-----+-----|     |      |     |-----+-----+-----+-----+-----+--------|
+|        |     |     |     |     |     |     |      |     |     |     |     |     |     |        |
+`--------+-----+-----+-----+-----+-----------'      `-----------+-----+-----+-----+-----+--------'
+   |     |     |     |     |WkspL|                              | ⌘⇧  |     |     |     |     |
+   `-----------------------------' ,-----------.  ,-----------. `-----------------------------'
+                                   |     |     |  |     |     |
+                             ,-----|-----|-----|  |-----+-----+-----.
+                             |     |     |     |  |     |     |     |
+                             |WkspR|     |-----|  |-----|     | Mod |
+                             |     |     |     |  |     |     |     |
+                             `-----------------'  `-----------------'
+
diff --git a/layouts/community/ergodox/issmirnov/build.sh b/layouts/community/ergodox/issmirnov/build.sh
new file mode 100755
index 000000000..7bb694d8a
--- /dev/null
+++ b/layouts/community/ergodox/issmirnov/build.sh
@@ -0,0 +1,2 @@
+#!/bin/bash
+make ergodox_ez:issmirnov
diff --git a/layouts/community/ergodox/issmirnov/config.h b/layouts/community/ergodox/issmirnov/config.h
new file mode 100644
index 000000000..fe62a7d1d
--- /dev/null
+++ b/layouts/community/ergodox/issmirnov/config.h
@@ -0,0 +1,3 @@
+// Reference: https://beta.docs.qmk.fm/reference/config-options
+// and https://github.com/qmk/qmk_firmware/blob/master/docs/config_options.md
+#include QMK_KEYBOARD_CONFIG_H
diff --git a/layouts/community/ergodox/issmirnov/keymap.c b/layouts/community/ergodox/issmirnov/keymap.c
new file mode 100644
index 000000000..ce853f3d3
--- /dev/null
+++ b/layouts/community/ergodox/issmirnov/keymap.c
@@ -0,0 +1,250 @@
+#include QMK_KEYBOARD_H
+
+// Custom user includes
+#include "issmirnov.h"
+#include "tap_tog.h"
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+[_QWERTY] = LAYOUT_ergodox_wrapper(
+KC_ESCAPE,      KC_1,   KC_2,   KC_3,   KC_4,   KC_5,   KC_EXLM,
+LCTL(KC_SPACE), _________________QWERTY_L1_________________,   KC_ASTR,
+KC_TAB,         _________________QWERTY_L2_________________,
+OSM(MOD_LSFT),  _________________QWERTY_L3_________________,   KC_SLASH,
+KC_LCTL, LSFT(KC_LGUI), LSFT(KC_LALT),  KC_LALT,   KC_LGUI,
+                                        XXXXXXX,  XXXXXXX,
+                                                XXXXXXX,
+                        KC_SPACE,   KC_BSPACE,  KC_DEL,
+
+KC_EQL    , KC_6    , KC_7    , KC_8    , KC_9          , KC_0    , KC_ESCAPE      ,
+KC_PLUS   , _________________QWERTY_R1_________________  , LGUI(KC_SPACE) ,
+            _________________QWERTY_R2_________________  , MO(_NAVI) ,
+KC_MINS   , _________________QWERTY_R3_________________  , KC_QUOTE       ,
+KC_ESCAPE , KC_COLN , KC_PERC , XXXXXXX , LGUI(KC_L)    ,
+
+KC_LEFT,  KC_RGHT,
+KC_UP,
+KC_DOWN,  KC_TAB, KC_ENTER
+),
+
+  // layer 1
+[_SYMB] = LAYOUT_ergodox_wrapper(
+KC_ESCAPE , KC_F1         , KC_F2         , KC_F3       , KC_F4            , KC_F5    , KC_F6    ,
+XXXXXXX   , _________________SYMB_L1___________________ ,KC_ASTR  ,
+KC_TAB    ,  _________________SYMB_L2___________________,
+KC_LSHIFT ,  _________________SYMB_L3___________________, KC_SLASH ,
+KC_LCTL   , LSFT(KC_LGUI) , LSFT(KC_LALT) , KC_LALT     , WKSP_LEFT  ,
+
+                                              XXXXXXX,        XXXXXXX,
+                                                            XXXXXXX,
+                                    WKSP_RIGHT, KC_BSPACE,    KC_DEL,
+
+KC_F7     , KC_F8    , KC_F9   , KC_F10    , KC_F11    , KC_F12  , XXXXXXX  ,
+KC_PLUS   , _________________SYMB_R1___________________ , MO(_NAVI)  ,
+           _________________SYMB_R2___________________  , KC_DQUO ,
+KC_MINS  , _________________SYMB_R3___________________ , KC_QUOTE ,
+KC_ESCAPE , KC_COLN  , KC_PERC , XXXXXXX   , XXXXXXX   ,
+
+KC_LEFT,  KC_RGHT,
+KC_UP,
+KC_DOWN,  KC_TAB, KC_ENTER
+),
+
+  // layer 2
+[_NUMP] = LAYOUT_ergodox_wrapper(
+XXXXXXX ,  ___________________XXXXX___________________, XXXXXXX  ,
+XXXXXXX , _________________NUMP_L1___________________ , KC_ASTR  ,
+KC_TAB  , _________________NUMP_L2___________________ ,
+XXXXXXX , _________________NUMP_L3___________________ , KC_SLASH ,
+TO(0)   , XXXXXXX,   XXXXXXX,   XXXXXXX,   XXXXXXX,
+
+                                            XXXXXXX  ,  XXXXXXX  ,
+                                                        XXXXXXX  ,
+                                            KC_SPACE , KC_BSPACE , KC_DEL ,
+
+KC_EQL  , ___________________XXXXX___________________ , RESET   ,
+KC_PLUS , _________________NUMP_R1___________________ , XXXXXXX ,
+          _________________NUMP_R2___________________ , XXXXXXX                                     ,
+KC_MINS , _________________NUMP_R3___________________ , XXXXXXX ,
+                KC_0    , XXXXXXX , XXXXXXX , TO(3)   , XXXXXXX ,
+
+KC_LEFT,  KC_RGHT,
+KC_UP,
+KC_DOWN,  KC_LALT, KC_LSFT
+),
+
+  // layer 3
+[_OVERWATCH] = LAYOUT_ergodox_wrapper(
+KC_ESCAPE, KC_1    , KC_2 , KC_3 , KC_4 , KC_5 , TO(0) ,
+______________OVERWATCH_L1_________________ , XXXXXXX ,
+______________OVERWATCH_L2_________________ ,
+______________OVERWATCH_L3_________________ , XXXXXXX ,
+______________OVERWATCH_L4_________________ ,
+
+XXXXXXX  , XXXXXXX ,
+XXXXXXX  ,
+KC_SPACE , XXXXXXX , XXXXXXX ,
+
+
+_______, _______, _______, _______, _______, _______, _______,
+_______, _______, _______, _______, _______, _______, _______,
+         _______, _______, _______, _______, _______, _______,
+_______, _______, _______, _______, _______, _______, _______,
+_______, _______, _______, _______, _______,
+
+_______, _______,
+_______,
+_______, _______, _______
+
+),
+// layer 4
+[_NAVI] = LAYOUT_ergodox_wrapper(
+KC_ESCAPE, KC_1    , KC_2 , KC_3 , KC_4 , KC_5 , KC_6 ,
+XXXXXXX, _________________NAVI_L1___________________ , XXXXXXX ,
+XXXXXXX, _________________NAVI_L2___________________ ,
+XXXXXXX, _________________NAVI_L3___________________ , XXXXXXX ,
+XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, WKSP_LEFT,
+
+XXXXXXX  , XXXXXXX ,
+XXXXXXX  ,
+WKSP_RIGHT , XXXXXXX , XXXXXXX ,
+
+
+_______, _______, _______, _______, _______, _______, _______,
+_______, _________________NAVI_R1___________________, _______,
+         _________________NAVI_R2___________________, _______,
+_______, _________________NAVI_R3___________________, _______,
+MODSFT, _______, _______, _______, _______,
+
+_______, _______,
+_______,
+_______, _______, KC_LGUI
+
+),
+};
+
+
+// called by QMK during key processing before the actual key event is handled. Useful for macros.
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+  uint8_t layer = biton32(layer_state);
+  switch (keycode) {
+    case TAP_TOG_LAYER:
+      process_tap_tog(_SYMB,record);
+      return false;
+      break;
+
+    case WKSP_LEFT:
+      // Only if TAP_TOG_LAYER is being held right now do we want to do actions.
+      if (record->event.pressed && (!tap_tog_layer_toggled_on || layer == _NAVI)) {
+        tap_code16(LGUI(LSFT(KC_Z)));
+        tap_tog_layer_other_key_pressed = true; // Add flag so layer resets
+      }
+      break;
+    case WKSP_RIGHT:
+      // Only if TAP_TOG_LAYER is being held right now do we want to do actions.
+      if (record->event.pressed && (!tap_tog_layer_toggled_on || layer == _NAVI)) {
+        tap_code16(LGUI(LSFT(KC_X)));
+        tap_tog_layer_other_key_pressed = true; // Add flag so layer resets
+      }
+      break;
+    default:
+      tap_tog_count = 0; // reset counter.
+      tap_tog_layer_other_key_pressed = true; // always set this to true, TAP_TOG_LAYER handlers will handle interpreting this
+      break;
+  }
+  return true;
+}
+
+// Runs constantly in the background, in a loop every 100ms or so.
+// Best used for LED status output triggered when user isn't actively typing.
+void matrix_scan_user(void) {
+  uint8_t layer = biton32(layer_state);
+  if (layer == 0) {
+    // Set up LED indicators for stuck modifier keys.
+    // https://github.com/qmk/qmk_firmware/blob/master/tmk_core/common/report.h#L118
+    switch (keyboard_report->mods) {
+      case MOD_BIT(KC_LSFT): // LSHIFT
+        ergodox_right_led_1_set (LED_BRIGHTNESS_LO);
+        ergodox_right_led_1_on ();
+        ergodox_right_led_2_set (LED_BRIGHTNESS_LO);
+        ergodox_right_led_2_on ();
+        ergodox_right_led_3_set (LED_BRIGHTNESS_HI);
+        ergodox_right_led_3_off ();
+        break;
+
+      case MOD_BIT(KC_LGUI): // LGUI
+        ergodox_right_led_1_set (LED_BRIGHTNESS_HI);
+        ergodox_right_led_1_off ();
+        ergodox_right_led_2_set (LED_BRIGHTNESS_LO);
+        ergodox_right_led_2_on ();
+        ergodox_right_led_3_set (LED_BRIGHTNESS_LO);
+        ergodox_right_led_3_on ();
+        break;
+
+      case MOD_BIT(KC_LSFT) ^ MOD_BIT(KC_LGUI):
+        ergodox_right_led_1_set (70);
+        ergodox_right_led_1_on ();
+        ergodox_right_led_2_set (70);
+        ergodox_right_led_2_on ();
+        ergodox_right_led_3_set (70);
+        ergodox_right_led_3_on ();
+        break;
+
+      default: // reset leds
+        ergodox_right_led_1_set (LED_BRIGHTNESS_HI);
+        ergodox_right_led_1_off ();
+        ergodox_right_led_2_set (LED_BRIGHTNESS_HI);
+        ergodox_right_led_2_off ();
+        ergodox_right_led_3_set (LED_BRIGHTNESS_HI);
+        ergodox_right_led_3_off ();
+    }
+  }
+}
+
+// only runs when when the layer is changed, good for updating LED's and clearing sticky state
+uint32_t layer_state_set_user(uint32_t state) {
+  uint8_t layer = biton32(state);
+
+  ergodox_board_led_off();
+  ergodox_right_led_1_off();
+  ergodox_right_led_2_off();
+  ergodox_right_led_3_off();
+
+  combo_enable(); // by default, enable combos.
+  switch (layer) {
+    case 0:
+      break;
+    case 1:
+      clear_mods();
+      ergodox_right_led_1_on();
+      break;
+    case 2:
+      clear_mods();
+      ergodox_right_led_2_on();
+      break;
+    case _OVERWATCH:
+      clear_mods();
+      combo_disable(); // We don't want combos in overwatch
+      ergodox_right_led_3_on();
+      break;
+    case 4:
+      ergodox_right_led_1_on();
+      ergodox_right_led_2_on();
+      break;
+    case 5:
+      ergodox_right_led_1_on();
+      ergodox_right_led_3_on();
+      break;
+    case 6:
+      ergodox_right_led_2_on();
+      ergodox_right_led_3_on();
+      break;
+    case 7:
+      ergodox_right_led_1_on();
+      ergodox_right_led_2_on();
+      ergodox_right_led_3_on();
+      break;
+    default:
+      break;
+  }
+  return state;
+};
diff --git a/layouts/community/ergodox/issmirnov/push.sh b/layouts/community/ergodox/issmirnov/push.sh
new file mode 100755
index 000000000..1a6c7c447
--- /dev/null
+++ b/layouts/community/ergodox/issmirnov/push.sh
@@ -0,0 +1,2 @@
+#!/bin/bash
+make ergodox_ez:issmirnov:teensy
diff --git a/layouts/community/ergodox/issmirnov/template.txt b/layouts/community/ergodox/issmirnov/template.txt
new file mode 100644
index 000000000..35c7920a1
--- /dev/null
+++ b/layouts/community/ergodox/issmirnov/template.txt
@@ -0,0 +1,17 @@
+,--------------------------------------------.      ,--------------------------------------------.
+|    0   |  1  |  2  |  3  |  4  |  5  |  6  |      | 38  | 39  | 40  | 41  | 42  | 43  | 44     |
+|--------+-----+-----+-----+-----+-----+-----|      |-----+-----+-----+-----+-----+-----+--------|
+|    7   |  8  |  9  | 10  | 11  | 12  | 13  |      | 45  | 46  | 47  | 48  | 49  | 50  | 51     |
+|--------+-----+-----+-----+-----+-----|     |      |     |-----+-----+-----+-----+-----+--------|
+|   14   | 15  | 16  | 17  | 18  | 19  |-----|      |-----| 52  | 53  | 54  | 55  | 56  | 57     |
+|--------+-----+-----+-----+-----+-----| 26  |      | 58  |-----+-----+-----+-----+-----+--------|
+|   20   | 21  | 22  | 23  | 24  | 25  |     |      |     | 59  | 60  | 61  | 62  | 63  | 64     |
+`--------+-----+-----+-----+-----+-----------'      `-----------+-----+-----+-----+-----+--------'
+   | 27  | 28  | 29  | 30  | 31  |                              | 65  | 66  | 67  | 68  | 69  |
+   `-----------------------------' ,-----------.  ,-----------. `-----------------------------'
+                                   | 32  | 33  |  | 70  | 71  |
+                             ,-----|-----|-----|  |-----+-----+-----.
+                             |     |     | 34  |  | 72  |     |     |
+                             | 35  | 36  |-----|  |-----| 74  | 75  |
+                             |     |     | 37  |  | 73  |     |     |
+                             `-----------------'  `-----------------'