graph TD;
id0(Reading parameters) --> id1
id1(Loop over species) --> id2(Loop over size-class)
id2 --> id3(Compute relative biomass)
id3 --> id4(Loop over number of schools)
id4 --> id5(Random draft of lenght)
id5 --> id6(Create school)
id6 --> id4
id6 --> id2
id6 --> id1
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