x1 = _75
x2 = _79
x3 = _84
x4 = _96
x5 = _99
x6 = _101
x7 = _105
x8 = _129
x9 = _147
x10 = _153
x11 = _174
x12 = _181
x13 = _198
x14 = species_1
x15 = species_2
x16 = species_3
x17 = species_4
x18 = species_5
x19 = species_6
x20 = species_7
x21 = species_8
x22 = species_9
x23 = species_10
x24 = species_11
x25 = species_12
x26 = species_13
x27 = species_14
x28 = species_15
x29 = _5
x30 = _9
x31 = _11
x32 = _13
x33 = _15
x34 = _19
x35 = _21
x36 = _25
x37 = _27
x38 = species_16
x39 = species_17
x40 = species_18
x41 = species_19
x42 = species_20
x43 = species_21
x44 = species_22
x45 = species_23
x46 = species_24
x47 = species_25
x48 = species_26
x49 = species_27
x50 = species_28
x51 = species_29
x52 = species_30
x53 = species_31