The binding energy per nucleon of ${.}_3^{7}Li$ and ${.}_2^{4}He$ nuclei are $5.60$ MeV and $7.06$ MeV, respectively. In the nuclear reaction ${.}_3^{7}Li+{.}_1^{1}H\to {.}_2^{4}He+{.}_2^{4}He+Q$, the value of energy $Q$ released is

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