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* add matrix_diagram.md * info.json: apply friendly formatting * add LAYOUT_60_true_hhkb_split_space with reference keymap * add LAYOUT_60_true_hhkb with reference keymap * add LAYOUT_60_true_hhkb_iso_split_space with reference keymap * add LAYOUT_60_true_hhkb_iso with reference keymap * add matrix position [2, 12] to LAYOUT_all * assign position [2, 12] to `KC_NUHS` in `default`/`via` keymaps