Data.Puzzles.GridShape

type Coord

type Size

data Square

data Dir

data Edge a

data Dir'

data Edge' a

class Dual2D a

type Key k

type Dual' k

data C

data N

class FromCoord a

class ToCoord a

edge

edge'

edgeBetween

edgeBetween'

orient

ends'

revEdge

edges

edgesM

ends

edgeSize

unorient

dualE

vertexNeighbours

edgeNeighbours