some(x, ...)
## S3 method for class 'data.frame':
some(x, n=10, ...)
## S3 method for class 'matrix':
some(x, n=10, ...)
## S3 method for class 'default':
some(x, n=10, ...)
head
, tail
.some(data.frame(z=rnorm(100), u=runif(100)))
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