\[\rselection{A^{m}_{m-2s}(q)\\
B^{m}_{m-2s}(q)}=\left(\dfrac{(m-s-1)!}{s!(m-1)!}\left(\frac{q}{4}\right)^{s}+%
O\left(q^{s+1}\right)\right)\lselection{A^{m}_{m}(q),\\
B^{m}_{m}(q).}\]