add a 3 way version of nand16

gates/nand16.v

@@ -1,6 +1,6 @@
 module nand16(y16, a16, b16);
     input [15:0]a16;
-    input[15:0]b16;
+    input [15:0]b16;
     output [15:0]y16;
 
     nand(y16[0], a16[0], b16[0]);

gates/nand3way16.v

@@ -0,0 +1,15 @@
+'include "gates/nand16.v"
+
+module nand3way16(y16, a16, b16, c16);
+    input [15:0]a16;
+    input [15:0]b16;
+    input [15:0]c16;
+    output [15:0]y16;
+
+    wire tmp0[15:0], tmp1[15:0]
+
+    nand16(tmp0, a16, b16);
+    nand16(tmp1, tmp0, tmp0);
+    nand16(y16, tmp1, c16);
+
+endmodule