pairs
RMap
parent
Empty
Inner
Leaf
Node
Empty
Inner
Leaf
Node
parent_=
Empty
Node
Empty
Node
propagate
Entry
push
AbelianCatamorph
CommuteCatamorph
MonoidCatamorph
RCatamorph
SignalCatamorph
pushUp
Empty
Inner
Leaf
Node
Empty
Inner
Leaf
Node