public Builder<T> identifiers(final Set<? extends T> identifiers) {
			return identifiers(Set.copyOf(identifiers)::contains);
		}
Set all identifier tokens.

@param identifiers the identifier tokens
@return {@code this} builder, for method chaining
@throws NullPointerException if the {@code identifiers} is {@code null}
jenetics.ext/src/main/java/io/jenetics/ext/internal/util/FormulaParser.java