Fig. 7From: RNA secondary structure factorization in prime tanglesTypes of tangles. A display of our tangle classification criteria. a A \({\mathcal {T}}\)-tangle, b a \({\mathcal {U}}\)-tangle, c a \({\mathcal {T}}{\mathcal {L}}\)-tangle, d a \({\mathcal {H}}\)-tangleBack to article page