h3_algos.c [701:712]:
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            H3Error neighborResult = h3NeighborRotations(
                origin, NEXT_RING_DIRECTION, &rotations, &origin);
            if (neighborResult) {
                // Should not be possible because `origin` would have to be a
                // pentagon
                // TODO: Reachable via fuzzer
                return neighborResult;
            }

            if (H3_EXPORT(isPentagon)(origin)) {
                // Pentagon was encountered; bail out as user doesn't want this.
                return E_PENTAGON;
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h3_algos.c [809:819]:
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        H3Error neighborResult = h3NeighborRotations(
            origin, NEXT_RING_DIRECTION, &rotations, &origin);
        if (neighborResult) {
            // Should not be possible because `origin` would have to be a
            // pentagon
            // TODO: Reachable via fuzzer
            return neighborResult;
        }

        if (H3_EXPORT(isPentagon)(origin)) {
            return E_PENTAGON;
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