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Enumerating the number of RNA structures

An RNA molecule is a sequence of nucleotides of four possible types, denoted by the letters A, C , G and U , connected by a backbone and is called RNA Primary Structure. Two nucleotides that are connected via hydrogen bonds are called a base pair. In the Watson-Crick base pairing, A always forms a base pair with U, as does G with C. In the Wobble base pairing, G forms a base pair with U.