hBoxF :: F a b -> F a b revHBoxF :: F a b -> F a b vBoxF :: F a b -> F a b revVBoxF :: F a b -> F a b matrixF :: Int -> F a b -> F a b tableF :: Int -> F a b -> F a b
hBoxF = placerF horizontalP vBoxF = placerF verticalPrevHBoxF = placerF (revP horizontalP) revVBoxF = placerF (revP verticalP)
matrixF = placerF . matrixP tableF = placerF . tableP