• Case 2: Suppose we have $x=\webleft [\webleft (1,b\webright )\webright ]=\webleft [\webleft (1,b'\webright )\webright ]$ for some $b,b'\in B$. Then, by Remark 2.2.4.1.3, we have a sequence
    \[ \webleft (1,b\webright )\sim 'x_{1}\sim '\cdots \sim 'x_{n}\sim '\webleft (1,b'\webright ). \]

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