Returns the immediate parents of a given model, i.e. those models M that are (in the poset ordering) less than the given model but for which there exists no other model M' such that M < M' < (given model).

1 | ```
parents(this, model)
``` |

`this` |
the object representing the model poset. |

`model` |
the model for which the parents should be found. |

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