Cardology Spreads (1893 Quadration) (命運牌陣)

Richmond's 1893 quadration recovered from the primary source and proven three ways — his own period-90 law, the modern Life Spread anchors as the unique solution, and a 52-for-52 match to the published karma chart — with the fixed cards, semi-fixed pairs and the '90 spreads' all derived as one permutation's cycle type.

Cost: 2 TIAN Points per call. tRPC procedure cardology.spreads.