ne_3 (1,-4)
se_3 (1,4)
se_10(3,3)
se_11(3,4)
se_12(4,1)
se_13(4,2)
se_14(4,3)
se_15(4,4)
sw_3 (-1,4)
sw_7 (-2,4)
sw_9 (-3,2)
sw_10(-3,3)
sw_11(-3,4)
sw_12(-4,1)
sw_13(-4,2)
sw_14(-4,3)
sw_15(-4,4)