species_9 <-> species_1
species_1 + species_4 <-> species_2 + species_3
species_2 <-> species_5
species_10 + species_2 <-> species_11 + species_8
species_10 + species_8 <-> species_11 + species_13
species_13 <-> species_14
species_13 <-> species_15
species_14 + species_15 <-> species_16 + species_17
species_14 + species_7 <-> species_16 + species_5
species_16 + species_17 <-> species_5 + species_7
species_15 + species_4 <-> species_20 + species_21
species_22 <-> species_2
species_23 + species_24 <-> species_22 + species_24
species_6 <-> species_16 + species_27
species_16 <-> species_27
species_16 + species_19 + species_23 <-> species_12 + species_18
species_12 + species_3 <-> species_28 + species_4
species_23 + species_24 <-> species_22 + species_24
species_22 + species_4 <-> 2*species_23 + species_24 + species_3
species_4 + species_5 <-> species_3 + species_6
species_28 <-> species_29
species_29 <-> species_30
species_3 + species_30 <-> species_31 + species_4
species_18 + species_31 <-> species_19 + species_32
2*species_3 <-> species_20 + species_4
species_18 <-> species_19
species_11 <-> species_10
species_23 + species_3 + (2/25)*species_31 + (1/5)*species_34 <-> (6/25)*species_33 + species_4
species_4 -> species_23 + species_3