Ascent++ | stack on top of each other

Assertion list for term "stack on top of each other".

Results from Ascent++: 5

container → CapableOf → stack on top of each other	0.40
box → CapableOf → stack on top of each other	0.32
joint → CapableOf → stack on top of each other	0.25
cup → CapableOf → stack on top of each other	0.16
storage box (`subgroup` of box) → CapableOf → stack on top of each other	0.16