species_1 -> species_2
species_3 -> species_2
species_4 -> species_5
species_5 -> species_4
species_5 -> species_6
species_7 -> species_4
species_2 -> species_7
species_2 -> species_8
species_9 -> species_10
species_7 -> species_2
species_12 -> species_7
species_7 -> species_13
species_13 -> species_7
species_16 -> species_10
species_7 -> species_17
species_19 -> species_18
species_18 -> species_20
species_17 -> species_7
species_17 -> species_21
species_21 -> species_7
species_21 -> species_23
species_23 -> species_7
species_23 -> species_7
species_23 -> species_11
species_23 -> species_11
species_26 -> species_25
species_25 -> species_27
species_11 -> species_28
species_28 -> species_11
species_11 -> species_29
species_10 + species_11 -> species_30
species_32 -> species_11
species_30 -> species_17
species_30 -> species_23
species_30 -> species_7