Print for a 'wbs' object

The function generates `M`

intervals, whose endpoints are
are drawn uniformly without replacements from `1`

,`2`

,..., `n`

. This routine can be
used inside `wbs`

function and is typically not called directly by the user.

1 | ```
random.intervals(n, M)
``` |

`n` |
a number of endpoints to choose from |

`M` |
a number of intervals to generate |

a `M`

by 2 matrix with start (first column) and end (second column) points of an interval in each row

1 | ```
random.intervals(10,100)
``` |

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