A function to sort pairs of integers or factors and identify the pairs

1 |

`c1` |
a vector of length n with value between 0 and N1 < n |

`c2` |
a vector of length n with value between 0 and N2 < n |

`spMat` |
logical: send back the contingency table as sparsely encoded (cost more than the algorithm itself). Default is FALSE |

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