%% ~s String White terminated
%% ~d Integer terminated by ~[0-9]
%% ~u Unsigned integer in base 2..36, no leading whitespace
%% ~- Optional sign character, no leading whitespace
%% ~f Float
%% ~a as ~s but converted to an atom
%% ~c characters without any stripping
%% ~n number of characters scanned
%% WHITE Skip white space
%% X Literal X
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