Inverse of a permutation

Various vector-like utilities for permutation objects such as
`length`

, `names()`

, etc

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`x` |
permutation object |

`value` |
In function |

These functions have methods only for word objects; cycle objects use
the methods for lists. It is easy to confuse the *length* of a
permutation with its `size`

.

It is not possible to set the length of a permutation; this is more trouble than it is worth.

Robin K. S. Hankin

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