# 2 swaps

# manually created
#    3.0    -5.0     4.0     1.0 
  +0.0 u  +4.0 x  +1.0 y  +2.0 z = -14.0
  +6.0 u  +3.0 x  -2.0 y +15.0 z = +10.0
 +12.0 u +10.0 x  -3.0 y +30.0 z =  +4.0
 -24.0 u         +19.0 y -72.0 z = -68.0