function normalize( list ) {
	var hash;
	var i;

	// Get unique values...
	hash = {};
	for ( i = 0; i < list.length; i++ ) {
		if ( !hasOwnProp( hash, list[ i ] ) ) {
			hash[ list[ i ] ] = true;
		}
	}
	list = objectKeys( hash );

	// TODO: sort such that printed columns are in lexicographic order, not rows, similar to bash behavior!

	// Sort the values in lexicographic order:
	list = list.sort();

	return list;
}
Normalizes a completion list.

@private
@param {Array} list - completion list
@returns {Array} normalized completion list