"present.w" -> "present.x"-
~"present.w" -> "present.x"+
"present.j" -> "present.k"-
~"present.j" -> "present.k"+
"present.k" -> "present.l"-
~"present.k" -> "present.l"+
@ "present.j" iscomb
@ "present.k" iscomb
@ "present.l" iscomb
connect "present.w" "present.P.a"
connect "present.x" "present.P.b"
connect "present.j" "present.Q.a"
connect "present.k" "present.Q.b"
connect "present.k" "present.R.a"
connect "present.l" "present.R.b"
