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The length of the two arguments must match, or one of them must be of length one. If the length of one argument is one, then the output's length will match the length of the other argument. See examples below.
lhs %+% rhs
Concatenated vectors.
Left hand side, character vector.
Right hand side, character vector.
"foo" %+% "bar" letters[1:10] %+% chr(1:10) letters[1:10] %+% "-" %+% chr(1:10) ## This is empty (unlike for parse) character() %+% "*"
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