A repeat sexual offender who struck again just four months after being released from confinement, was sentenced yesterday to serve 20 years for his most recent offense, this time against a 12-year-old girl. Lorenzo Townes, 49, pleaded guilty to forcible sodomy, abduction with intent to defile and breaking and entering in the July 11 incident. He admitted to police that he crept into the girl's home, threw her onto a bed and sexually assaulted her. ... Snukals sentenced him to 50 years in prison for each charge, but suspended 30 years of the sodomy sentence, 45 years of the abduction...