0 -> species_0000001
species_0000001 + species_0000002 -> 0
species_0000001 -> species_0000002 + species_0000006
species_0000001 + species_0000007 -> species_0000009
species_0000001 + species_0000006 -> 2*species_0000008
species_0000006 -> 2*species_0000008
species_0000006 -> 0
species_0000008 -> 0
0 -> species_0000006 + species_0000011
species_0000008 -> species_0000011
species_0000009 -> 0
0 -> species_0000002
species_0000002 -> 0
species_0000011 -> species_0000007
species_0000007 -> species_0000009 + species_0000011
2*species_0000007 -> 0
species_0000001 <-> 0