diff --git a/libraries/extra.lib b/libraries/extra.lib
new file mode 100755
index 0000000..c29d238
--- /dev/null
+++ b/libraries/extra.lib
@@ -0,0 +1,17 @@
+
+GATE    BUF_BUILTIN          0  out=inp;
+PIN *   NONINV 1 999 0.00001 0.00001 0.00001 0.00001
+
+GATE    AND2B       16  O=(!AN*B);
+PIN *   NONINV 1 999 1 0.2 1 0.2
+
+LATCH   C3          20  Q=A*B*C+(A+B+C)*Q_NEXT;
+PIN A   NONINV 1 999 1 0.2 1 0.2
+PIN B   NONINV 1 999 1 0.2 1 0.2
+PIN C   NONINV 1 999 1 0.2 1 0.2
+SEQ Q   Q_NEXT ASYNCH
+
+LATCH   SR          20  Q=S*!R+S*Q_NEXT;
+PIN S   NONINV 1 999 1 0.2 1 0.2
+PIN R   NONINV 1 999 1 0.2 1 0.2
+SEQ Q   Q_NEXT ASYNCH