@@ -14,5 +14,6 @@ IN a, b;
     OUT out;
 
     PARTS:
-    // Put your code here:
+    Nand(a=a, b=b, out=nand-out);
+    Not(in=nand-out, out=out);
 }

@@ -13,5 +13,5 @@ IN in;
     OUT out;
 
     PARTS:
-    // Put your code here:
-}+    Nand(a=in, b=in, out=out);
+}

@@ -14,5 +14,7 @@ IN a, b;
     OUT out;
 
     PARTS:
-    // Put your code here:
+    Not(in=a, out=not1);
+    Not(in=b, out=not2);
+    Nand(a=not1, b=not2, out=out);
 }

@@ -3,7 +3,6 @@ # Progress
 
 ## TODO
 And16
-And
 DMux4Way
 DMux8Way
 DMux
@@ -12,11 +11,12 @@ Mux4Way16
 Mux8Way16
 Mux
 Not16
-Not
 Or16
 Or8Way
+
+## DONE
+And
+Not
 Or
 Xor
 
-## DONE
-

@@ -13,5 +13,7 @@ IN a, b;
     OUT out;
 
     PARTS:
-    // Put your code here:
-}+    Nand(a=a, b=b, out=nand-out);
+    Or(a=a, b=b, out=or-out);
+    And(a=nand-out, b=or-out, out=out);
+}