x-low | x-ok | x-high y-high | y-high | y-high OUTSID[4,j] | OUTSID[3,j] | OUTSID[2,j] -------------+-------------+------------ x-low | x-ok | x-high y-ok | y-ok | y-ok OUTSID[5,j] | | OUTSID[1,j] -------------+-------------+------------ x-low | x-ok | x-high y-low | y-low | y-low OUTSID[6,j] | OUTSID[7,j] | OUTSID[8,j]