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# e("s","s") ≥ e("t","s"), et# e("s","t") > e("t","t")pour tout "t"≠"s".
following the terminology given in the first definition above, we have (adapted from thomas, 1985):# e("s","s") ≥ e("t","s"), and# e("s","t") > e("t","t")for all "t"≠"s".