# NOT RUN {
# mpg in mtcars
"mpg" %xy% mtcars
# year not in mtcars
"year" %xy% mtcars
# check each name
c("mpg", "year") %xy% mtcars
# check for any
c("mpg", "year") %any% mtcars
# check for all
c("mpg", "year") %all% mtcars
# }
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