x1 = s121 x2 = s122 x3 = s124 x4 = s125 x5 = s126 x6 = s127 x7 = s128 x8 = s129 x9 = s130 x10 = s131 x11 = s132 x12 = s133 x13 = s134 x14 = s135 x15 = s139 x16 = s150 x17 = s152 x18 = s153 x19 = s154 x20 = s159 x21 = s160 x22 = s161 x23 = s164 x24 = s167