Standard feature names
containers
\nl
\indent item -- access operation \n
\indent count -- number of items \n
\indent has -- membership test\n
\indent put -- insert or replace item\n
\indent force -- like put\n
\indent remove -- remove an item\n
\indent {\em wipe_out} -- remove all items\n
\indent empty -- absence of items\n
\indent full -- no more space
slide: Feature names for containers