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Two identical unloaded generators are connected in parallel as shown in the figure. Both the generators are having positive, negative and zero sequence impedances of $j0.4$ p.u., $j0.3$ p.u. and $j0.15$ p.u., respectively. If the pre-fault voltage is $1$ p.u., for a line-to-ground $(L-G)$ fault at the terminals of the generators, the fault current, in p.u., is ___________.

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