
7 7
#   i  j  k   P Q
1  -1  0  0   0 0   0		# -P <= i <= 0
1   1  0  0   1 0   0		#
1   0 -1  0   0 0   0		# i <= j <= 0
1  -1  1  0   0 0   0		#
1   0  0 -1   0 0   0		# i-j <= k <= 0
1  -1  1  1   0 0   0		# 
0   1  1  1   0 -1  0		# Q = i+j+k

0 4

