src/main/java/com/github/fge/grappa/parsers/BaseParser.java
@Cached
    @DontLabel
    public Rule sequence(final Object[] rules)
    {
        Objects.requireNonNull(rules);
        return rules.length == 1 ? toRule(rules[0])
            : new SequenceMatcher(toRules(rules));
    }
@Cached
    @DontLabel
    public Rule sequence(final Object[] rules)
    {
        Objects.requireNonNull(rules);
        return rules.length == 1 ? toRule(rules[0])
            : new SequenceMatcher(toRules(rules));
    }
Match a given set of rules, exactly once

@param rules the rules
@return a rule