## Not run:
# helper_fn <- define('some/dir/helper_fn')
# define(c('some/dir/helper_fn', 'some/other_dir/library_fn'), function(helper_fn, library_fn) { ... }
# helper_fns <<- define('some/dir/helper_fn1', 'some/otherdir/helper_fn2')
# helper_fns[[1]]('do something'); helper_fns[[2]]('do something else')
# ## End(Not run)
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