<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:

def voice(self, consonant) :
		'''
		Voices a consonant, by searching the sound inventory for a consonant having the same
		features as the argument, but +voice.
		'''
		voiced_consonant = deepcopy(consonant)
		voiced_consonant[Voiced] = Voiced.pos
		return self._find_sound(voiced_consonant)