flock_categorical_hypercube_diagram.md

 Obj <- _ -> Obj <- _ -> Nat <- _ -> Nat          Nat <- _ -> Nat <- _ -> Lit <- _ -> Lit
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 Obj <- _ -> Obj <- _ -> Nat <- _ -> Nat          Nat <- _ -> Nat <- _ -> Lit <- _ -> Lit
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 _           _           _           _   <- _ ->  _           _           _           _
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 Dur <- _ -> Dur <- _ -> Lit <- _ -> Lit          Obj <- _ -> Obj <- _ -> Dur <- _ -> Dur
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 Dur <- _ -> Dur <- _ -> Lit <- _ -> Lit          Obj <- _ -> Obj <- _ -> Dur <- _ -> Dur

                   ^                                                ^
                   |                                                |
                   _                                                _
                   |                                                |
                   v                                                v

 Dur <- _ -> Dur <- _ -> Lit <- _ -> Lit          Lit <- _ -> Lit <- _ -> Dur <- _ -> Dur
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 Dur <- _ -> Dur <- _ -> Lit <- _ -> Lit          Lit <- _ -> Lit <- _ -> Dur <- _ -> Dur
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 _           _           _           _   <- _ ->  _           _           _           _
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 Obj <- _ -> Obj <- _ -> Nat <- _ -> Nat          Nat <- _ -> Nat <- _ -> Obj <- _ -> Obj
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 Obj <- _ -> Obj <- _ -> Nat <- _ -> Nat          Nat <- _ -> Nat <- _ -> Obj <- _ -> Obj