"buff_test.buf1.a"->"buff_test.buf1._y"-
~("buff_test.buf1.a")->"buff_test.buf1._y"+
"buff_test.buf1._y"->"buff_test.buf1.y"-
~("buff_test.buf1._y")->"buff_test.buf1.y"+
= "buff_test.supply.vdd" "buff_test.buf1.vdd"
= "buff_test.supply.vss" "buff_test.buf1.vss"
= "buff_test.out" "buff_test.buf1.y"
= "buff_test.in" "buff_test.buf1.a"