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XL1520P-A 
 4-Conductor-Locking Cord L15-20P
 18,16,14,12
  SJ,SJO,SJOW,SJOO,SJOOW,SJT,SJTW,SJTO.SJTOW.
  SJTOO,SJTOOW,S,SO,SOW,SOO,SOOW ST,STW
  STO,STOW,STOO,STOOW