Why does my stereo wires have more than 1 of each color?

sintra3

New member
The 1992 camry wiring diagram comes up to about 19 wires, my stock stereo that I unplugged from the back on the harness has about 14, and it has 3 black wires 2 brow, 2 green and 2 red, the others only have one wire, why is this?
 
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