“…More precisely, (2.6a) is obtained by setting ρ 1 , ρ 2 → ∞, (2.6b) is derived by taking q → q 2 , ρ 1 → ∞, ρ 2 → −q, (2.6c) is followed by setting ρ 1 → √ q, ρ 2 → − √ q, and (2.6d) is derived by taking ρ 1 → ∞, ρ 2 → −1. For more details, see, for example, [16,20,30]. Moreover, by applying Bailey's lemma iteratively to an appropriate Bailey pair in the simple sum case, one can obtain multi-analog identities of Rogers-Ramanujan type straightforwardly.…”