startshape N rule J { J_5by5 { s 1 } N { r 5 y 3 s 0.999 } } rule A { A_5by5 { s 1 } J { r 5 y 2 s 0.999 } } rule X { X_5by5 { s 1 } A { r 5 y 2 s 0.999 } } rule O { O_5by5 { s 1 } X { r 5 y 2 s 0.999 } } rule N { N_5by5 { s 1 } O { r 5 y 2 s 0.999 } } include i_pix.cfdg