Hole
matryoshka
head
StreamOps
headOption
RecListFOps
ListF
height
matryoshka
histo
Recursive
Ops
hmap
CoEnv
EnvT
holes
matryoshka
holesList
matryoshka
htraverse
CoEnv
EnvT
hylo
matryoshka
IdOps
hyloM
matryoshka
IdOps