set some_key 0 0 1
Of course, 1st argument(e.g. some_key) is the key. But, what are rest of arguments?
2nd argument : flag2nd argument(e.g. 0) is the flag. The flag is a 32bit integer value to determine how persist data into memcached. And let's check where flag appears on the telnet, use set, get and replace(same arguments with set).
set some_key 0 0 1 a STORED get some_key VALUE some_key 0 1 a END replace some_key 1 0 1 b STORED get some_key VALUE some_key 1 1 b END(continue to phosphorescence: Arguments of set command on memcached telnet (2))