A => 1 B => 1 C => 1 AW => 1 AX => 1 AY => 1 AZ => 1 BW => 1 BX => 1 BY => 1 BZ => 1 CW => 1 CX => 1 CY => 1 CZ => 1 AWW => 1 AWX => 1 AWY => 1 AWZ => 1 AXW => 1 AXX => 1 AXY => 1 AXZ => 1 AYW => 1