Initialization: draw γ0 from the uniform distribution on Γ:
(1). draw ${\gamma }_1^{\left(t\right)}$ according to $\Pi ({\gamma }_1\mid Y,{\gamma }_2^{(t-1)},\cdots ,{\gamma }_k^{(t-1)},X)$,
(2). draw ${\gamma }_2^{\left(t\right)}$ according to $\Pi ({\gamma }_1\mid Y,{\gamma }_1^{\left(t\right)},{\gamma }_3^{(t-1)}\cdots ,{\gamma }_k^{(t-1)},X)$,
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(k). draw ${\gamma }_k^{\left(t\right)}$ according to $\Pi ({\gamma }_1\mid Y,{\gamma }_1^{\left(t\right)},\cdots ,{\gamma }_{k-1}^{\left(t\right)}{\gamma }_k^{(t-1)},X)$,