Creates a matrix with all combinations of 1 to all elements of the
vector provided. Elements to occur in all combinations can be specified.
This is internally called by `brute.search`

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`x` |
A vector of elements of which combinations are to be formed. |

`force` |
A vector of elements that are supposed to occur in each combination. |

`trace` |
A boolean indicating if some output should be printed (TRUE) or not (FALSE=default). |

A matrix with one combination per row. For the shorter combinations, the columns to the right are filled up with NA.

Lutz P Breitling <lutz.breitling@gmail.com>

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