old_contents: from .itertoolz import (groupby, countby, frequencies,
          first, second, nth, take, drop, rest, last, get,
          merge_sorted,
          interleave, unique, intersection, iterable, distinct)
  
  from .functoolz import (remove, iterate, accumulate,
          memoize, curry,
          thread_first, thread_last)
  
  from .dicttoolz import merge, keymap, valmap
  
new_contents: from .itertoolz import (groupby, countby, frequencies,
          first, second, nth, take, drop, rest, last, get,
          merge_sorted,
          interleave, unique, intersection, iterable, distinct)
  
  from .functoolz import (remove, iterate, accumulate,
          memoize, curry,
          thread_first, thread_last)
  
  from .dicttoolz import merge, keymap, valmap, assoc, update_in
  
subject: add top-level imports for assoc/update_in