public static String toString(final List<? extends Symbol<?>> sentence) {
		return sentence.stream().map(Symbol::name).collect(joining());
	}
Converts a list of symbols to a string, by concatenating the names of
the given symbols.

@param sentence the symbol list to covert
@return the converted sentences
jenetics.ext/src/main/java/io/jenetics/ext/grammar/SentenceGenerator.java