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<div>Sorry if this is long after the original discussion, but I am still trying to catch up:</div>
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<div>Akiva Miller wrote:</div>
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<div>"I have no idea what the source is for it, but I can tell you that we said it at all the Shabbatonim which I attended from around 1967-1977, which were run by Yeshiva University's Youth Bureau. "</div>
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<div>Growing up we did not add the 4 pasukim when singing bentchen around my father's shabbos table until after I returned from summer sleep away camp in 1958 where that was apparently a standard part of bentchen.</div>
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<div>David I. Cohen</div>