src/main/software/amazon/event/ruler/ACFinder.java [148:171]:
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    private static Set<SubRuleContext> calculateCandidateSubRuleIdsForNextStep(final Set<SubRuleContext> currentCandidateSubRuleIds,
                                                                       final NameState fromState,
                                                                       final Patterns fromPattern) {
        // These are all the sub-rules that use the matched pattern to transition to the next NameState. Note that they
        // are not all candidates as they may have required different values for previously evaluated fields.
        Set<SubRuleContext> subRuleIds = fromState.getNonTerminalSubRuleIdsForPattern(fromPattern);

        // If no sub-rules used the matched pattern to transition to the next NameState, then there are no matches to be
        // found by going further.
        if (subRuleIds == null) {
            return null;
        }

        // If there are no candidate sub-rules, this means we are on the first NameState and must initialize the
        // candidate sub-rules to those that used the matched pattern to transition to the next NameState.
        if (currentCandidateSubRuleIds == null || currentCandidateSubRuleIds.isEmpty()) {
            return subRuleIds;
        }

        // There are candidate sub-rules, so retain only those that used the matched pattern to transition to the next
        // NameState.
        Set<SubRuleContext> candidateSubRuleIdsForNextStep = new HashSet<>();
        intersection(subRuleIds, currentCandidateSubRuleIds, candidateSubRuleIdsForNextStep);
        return candidateSubRuleIdsForNextStep;
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src/main/software/amazon/event/ruler/Finder.java [138:161]:
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    private static Set<SubRuleContext> calculateCandidateSubRuleIdsForNextStep(final Set<SubRuleContext> currentCandidateSubRuleIds,
                                                                       final NameState fromState,
                                                                       final Patterns fromPattern) {
        // These are all the sub-rules that use the matched pattern to transition to the next NameState. Note that they
        // are not all candidates as they may have required different values for previously evaluated fields.
        Set<SubRuleContext> subRuleIds = fromState.getNonTerminalSubRuleIdsForPattern(fromPattern);

        // If no sub-rules used the matched pattern to transition to the next NameState, then there are no matches to be
        // found by going further.
        if (subRuleIds == null) {
            return null;
        }

        // If there are no candidate sub-rules, this means we are on the first NameState and must initialize the
        // candidate sub-rules to those that used the matched pattern to transition to the next NameState.
        if (currentCandidateSubRuleIds == null || currentCandidateSubRuleIds.isEmpty()) {
            return subRuleIds;
        }

        // There are candidate sub-rules, so retain only those that used the matched pattern to transition to the next
        // NameState.
        Set<SubRuleContext> candidateSubRuleIdsForNextStep = new HashSet<>();
        intersection(subRuleIds, currentCandidateSubRuleIds, candidateSubRuleIdsForNextStep);
        return candidateSubRuleIdsForNextStep;
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