Filters duplicate entries if the indices overlap.

@param {Array} indices The array with indices to be filtered.
@returns {Array} The filtered array.
function( indices ) {
	indices = sortIndices( indices );
	var filtered = [];
	for ( var i = 0; i < indices.length; i++ ) {
		// If the next index is within the range of the current index and the length of the word, remove it
		// This makes sure we don't match combinations twice, like "even though" and "though".
		if ( ! isUndefined( indices[ i + 1 ] ) && indices[ i + 1 ].index < indices[ i ].index + indices[ i ].match.length ) {
			filtered.push( indices[ i ] );

			// Adds 1 to i, so we skip the next index that is overlapping with the current index.
			i++;
			continue;
		}
		filtered.push( indices[ i ] );
	}
	return filtered;
}