#import std
#import nat
#import lat

x = grid/<'a','bc','def','ghij'> <&!>

xpress  = bwi :^/~&l ~&rdS; ~&i&& :/`(+ --')'+ mat`,
paths   = fwi ^rlrDlShiX2lNXQ\~&rv ~&l?\~&rdNCNC ~&rdPlLPDrlNCTS
roll    = swi ^H\~&r -$+ ~&lizyCX

neighbors = 

fswi ^\~&rdvDlS :^/~&ll ^T(
   ~&lrNCC+ ~&rilK16rSPirK16lSPXNNXQ+ ~&rdPlrytp2X,
   ~&rvdSNC)