Tip — the cut runs left–right (the small arrows). Click a ring to turn that face 30°, or drag it round either way; click the PUCK half to flip the upper half of the puck over, swapping its six front pieces with the six behind them. The back is drawn as you’d see it after turning the puck over, so a flipped piece lands in the same spot on the other picture.
σ ε
EvenOddCentre flipped
Apply a move sequence
Conjugates — record a sequence α, then undo it with α⁻¹nothing recorded