def start_proc_insanity_check(p_string):
if FORK_TOKEN + FORK_TOKEN in p_string:<EOL><INDENT>raise SanityError("<STR_LIT>"<EOL>"<STR_LIT>"<EOL>"<STR_LIT>")<EOL><DEDENT>
This function checks if there is a starting process after the beginning of
each fork. It checks for duplicated start tokens ['(('].

Parameters
----------
p_string: str
     String with the definition of the pipeline, e.g.::
         'processA processB processC(ProcessD | ProcessE)'