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Erlang Processes unregister

-module(helloworld). 
-export([start/0, call/2]). 

call(Arg1, Arg2) -> 
   io:fwrite("~p~n",[Arg1]). 

start() -> 
   Pid = spawn(?MODULE, call, ["hello", "process"]), 
   register(myprocess, Pid), 
   io:fwrite("~p~n",[whereis(myprocess)]), 
   unregister(myprocess), 
   io:fwrite("~p~n",[whereis(myprocess)]).

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