s4 -> s3
s5 -> s2
s7 -> s6
s6 -> s8
s2 -> s3
s3 -> s9
s3 -> s10
s11 -> s3
s13 -> s12
s3 -> s9
s47 + s51 -> s45
s48 + s51 <-> s50
s52 <-> s48
s48 -> s47
s45 <-> s50
s45 + s57 -> s58
s58 <-> s61
s61 -> s50 + s57
s60 <-> s62
s58 <-> s60
s61 <-> s62
s22 <-> s20
s19 -> s17
s17 -> s19
s16 + s17 <-> s28
s28 -> s26
s26 -> s27
s26 -> s28
s27 -> s26
s27 -> s16 + s17
s25 -> s14
s14 -> s25
s21 -> s23
s63 -> s64
s65 -> s66
s66 -> s51 + s57
s62 <-> s48 + s65
s95 <-> s93
s94 <-> s92
s91 + s93 <-> s110
s110 <-> s112
s111 + s112 <-> s113
s113 <-> s114 + s93
s98 -> s91
s114 -> s111 + s98
s115 -> s106
s108 -> s115
s103 -> s102
s102 -> s103
s97 -> s101
s101 -> s97
s96 -> s100
s100 -> s96
s99 -> s104
s104 -> s99
s106 -> s35
s37 -> s51
s38 -> s39
s43 -> s100
s100 -> s43
s44 -> s104
s104 -> s44
s42 -> s107
s107 -> s42
s105 -> s49
s51 -> s116
s45 -> s117 + s47
s50 -> s117 + s48
s66 -> s118 + s57
s65 -> s118 + s57
s61 -> s48 + s57
s62 -> s48 + s57
s58 -> s47 + s57
s60 -> s47 + s57