a   b   i x          y          j
pan pan 1 0.34679014 0.72680286 1.45360573
eks pan 2 0.75867996 0.52215111 1.04430222
wye wye 3 0.20460331 0.33831853 0.67663705
eks wye 4 0.38139939 0.13418874 0.26837749
