Simplify a formula, assuming it is hierarchical, that is, an interaction implies all lower-order interactions and main effects involving the same variables are in the model.

1 |

`formula` |
an object of class |

A character string coercible to a formula equivalent to the input.

1 | ```
tidy.formula.hierarchical(y ~ u + v + w + u:v + u:w + v:w + u:v:w)
``` |

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