Calculate equivalent resistance across $A-B$ ............... $\Omega$
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since all resistance between point $\mathrm{A}$ and $\mathrm{B}$ so all in parallel
$\boxed{{{\left. {{{\text{R}}_{{\text{eq}}}}} \right|}_{{\text{AB}}}} = \frac{{\text{R}}}{4} = \frac{4}{4} = 1\Omega }$
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