s10 -> s11
s2 -> s9
s9 -> species_12
s10 -> species_12
s11 -> species_12
s13 -> s10
species_2 -> species_1
s11 + species_3 -> species_4
species_1 -> species_3
species_1 -> species_12
species_4 -> species_12
species_3 -> species_1
species_3 -> species_12