.subckt ND2X1 1 2 3 4 5 6 7
  m$1 1 6 2 4 MLVPMOS L=0.25um W=1.5um
  m$2 2 5 1 4 MLVPMOS L=0.25um W=1.5um 
  m$3 8 6 3 7 MLVNMOS L=0.25um W=0.95um 
  m$4 2 5 8 7 MLVNMOS L=0.25um W=0.95um 
.ends ND2X1