Headcount Tram

Line up passengers’ heads, not their feet. Upright and headstanding riders share shifting seat platforms; a waiting B rider can survive the A group’s departure. Each rider is a two-cell vertical piece. Turn swaps head and feet. A trio of A heads across three neighboring seats at the same height leaves first; then a B trio. Matching riders leave whole, not just heads. Platforms change from0,1,0,1 to1,0,1,0 after A; waiting riders drop to new seat floors. Leave headroom: a rising platform can crush an overfull waiting seat. Queue A,B,A,B,A,B with a one-rider reserve, once per boarding. Retrieve reserve after queue exhaustion. Eight committed actions, six riders; all orientation/aim/reserve planning free. Undo restores exact riders/platforms/queue.