Corne keyboard layout for qmk via
Layer 0 (default)
Layer 1
Layer 2
Layer 3
Left part, left thumb buttom - hold LWin, tap [
Left part, right thumb button - hold Layer 1, tap Tab
Right part, left thumb button - hold Layer 2, tap Enter
Right part, middle thumb button - hold LAlt, tap Backspace
Right part, right thumb button - hold RWin, tap ]