# Remove doublons from the matches
	#
	# Preverse the lowest score of all the matches for a MEntity.
	fun uniq: IndexMatches do
		var scores = new HashMap[MEntity, IndexMatch]
		var res = new Array[IndexMatch]
		for match in self do
			var mentity = match.mentity
			if scores.has_key(mentity) then
				var older = scores[mentity]
				if match.score < older.score then older.score = match.score
			else
				scores[mentity] = match
				res.add match
			end
		end
		return new IndexMatches.from_matches(res)
	end