12 part; 4th observation; b = 1456 Bob single; d = 123456 Double; v = 38 Bob; w = 56 Bob; z = 345678 Double.
a = bV.dB.vI.wt
Not atw.
60 crus (30f,30b), 30 5678s (12f,18b), 30 6578s (18f,12b), 116 4-bell runs (58f,58b), 336 5678 combinations (168f,168b), 30 8765s (18f,12b), Backrounds, 15 87s at back.