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@@ -2291,7 +2291,8 @@ cS VHELP =\
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"@ monadic abs |x|" "\n"\
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"@ dyadic at pick elts from x by indices from y" "\n"\
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"@. monadic shuffle shuffle elts of x" "\n"\
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-"@. dyadicn member check whether x is in y" "\n"\
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+"@. dyadic member check whether x is in y" "\n"\
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+"@: dyadic indexof yield index of x in y or #y if x not in y" "\n"\
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"{ monadic head first two elts of x, same as 2#" "\n"\
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"{ dyadic bin bin search, e.g. 1 3 5 7 9{8 9 0 yields 3 4 -1" "\n"\
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"{. monadic tail last elt of x" "\n"\
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