.PS
cct_init
textwid = 0.8
xgap = 0.75
{  {AND_gate ;  "{\tt AND\_gate}" ljust at last [].w + (xgap,0)}
   move down 0.4; right_
   {OR_gate ;  "{\tt OR\_gate}" ljust at last [].w + (xgap,0)}
   move down 0.4; right_
   {BUFFER_gate ;  "{\tt BUFFER\_gate}" ljust at last [].w + (xgap,0)}
   move down 0.4; right_
    XOR_gate ;  "{\tt XOR\_gate}" ljust at last [].w + (xgap,0)
   }

   move right_ 2.4
   {NAND_gate ;  "{\tt NAND\_gate}" ljust at last [].w + (xgap,0)}
   move down 0.4; right_
   {NOR_gate ;  "{\tt NOR\_gate}" ljust at last [].w + (xgap,0) }
   move down 0.4; right_
   {NOT_gate ;  "{\tt NOT\_gate}" ljust at last [].w + (xgap,0)}
   move down 0.4; right_
   NXOR_gate ;  "{\tt NXOR\_gate}" ljust at last [].w + (xgap,0)
.PE