i:{(*"n"=*x;.'x@1+2*!6)}'1_''(&'|/"o=.,"=\:i)_'i:0:"i/22"
s:{((x|y),x&y)0 7 2 9 4 11}
f:{&/~(x[0]>y[1];x[1]<y[0];x[2]>y[3];x[3]<y[2];x[4]>y[5];x[5]<y[4])}
r:(!0;!0){c:*|y;u:(s[c]'(f[c]')#)'x;(u[1],((*y)#,c),*x;u[0],x@1)}/i
-/+/'{*/1+-/'x@/:(1 0;3 2;5 4)}''r