Necchi Lycia 522 very old machine cable wiring?

The wires have come out of the socket that goes into the machine and to the foot pedal. There are four places and six wires so I know that some have to double up, but no matter how hard I try I can't get it back together correctly. So basically I need to know which colour wires go in which holes, and which the foot pedal wires double up with!! The cable is old so the colours are red, black and green. The foot pedal wires are both white.