Trip 3A from eXpression Climbing

Legend has it that when Romain Desgranges gets bored, he likes to do puzzles (sometimes up to 1000 pieces). He designed an entire range of interchangeable volumes, a puzzle if you will. Trip 3 A forms the base of the Trip 3 triangle, to be combined with too many other volumes to list here. Ok, since you insist, we’ll suggest a couple: you can combine Trip 3 A + 2 B + 3 C, as well as 3 A + 1 B + 2 C... So, will you find the winning combination? Measures 41"x18.5"x20.5"