Step by Step Problems No.15/Answer

Step 0              Step 1              Step 2              Step 3              Step 4
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|       |   |   |   |       |   |   |   |       |   |   |   |       |   |   |   |       |   |   |
+---+---+---+   +   +---+---+---+   +   +---+---+---+   +   +---+---+---+   +   +---+---+---+   +
|   |       |   |   |   |       |   |   |   |       |   |   |   |       |   |   |   |XXX|XXX|   |
+---+       +---+   +---+       +---+   +---+       +---+   +---+       +---+   +---+---+---+---+
|   |       |   |   |   |       |   |   |   |       |   |   |   |       |   |   |   |       |   |
+   +---+---+---+   +   +---+---+---+   +   +---+---+---+   +   +---+---+---+   +   +       +---+
|   |   |       |   |   |   |       |   |   |   |XXX|XXX|   |   |XXX|XXX|   |   |   |       |   |
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|XXX|       |XXX|   |       |XXX|XXX|   |       |       |   |       |       |   |       |       |
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+

Step 5              Step 6              Step 7              Step 8              Step 9
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|       |XXX|   |   |XXX|       |   |   |XXX|       |   |   |   |       |   |   |   |       |   |
+---+---+---+   +   +---+---+---+   +   +---+---+---+   +   +   +---+---+   +   +   +---+---+   +
|   |XXX|   |   |   |   |XXX|   |   |   |XXX|   |   |   |   |   |   |   |   |   |   |   |   |   |
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|   |       |   |   |   |       |   |   |   |       |   |   |XXX|       |   |   |       |XXX|   |
+   +       +---+   +   +       +---+   +   +       +---+   +---+       +---+   +       +---+---+
|   |       |   |   |   |       |   |   |   |       |   |   |XXX|       |   |   |       |XXX|   |
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|       |       |   |       |       |   |       |       |   |       |       |   |       |       |
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+

Step 10             Step 11             Step 12             Step 13             Step 14
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|   |       |   |   |   |       |XXX|   |   |XXX|       |   |   |   |       |   |   |   |       |
+   +---+---+   +   +   +---+---+---+   +   +---+---+---+   +   +---+---+---+   +   +---+---+---+
|   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |XXX|   |   |   |   |   |XXX|   |
+---+---+---+---+   +---+---+---+   +   +---+---+---+   +   +---+---+---+   +   +---+---+---+   +
|       |   |XXX|   |       |   |   |   |       |   |   |   |       |   |   |   |       |   |   |
+       +---+---+   +       +---+---+   +       +---+---+   +       +---+---+   +       +---+---+
|       |XXX|   |   |       |XXX|   |   |       |XXX|   |   |       |XXX|   |   |       |XXX|   |
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|       |       |   |       |       |   |       |       |   |       |       |   |       |       |
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+

Step 15             Step 16             Step 17             Step 18             Step 19
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|   |   |       |   |   |   |       |   |XXX|   |       |   |XXX|XXX|       |   |       |XXX|XXX|
+   +---+---+---+   +   +---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|   |   |   |   |   |   |   |   |   |   |XXX|   |   |   |   |   |   |   |   |   |   |   |   |   |
+---+---+---+   +   +---+---+---+   +   +---+---+---+   +   +---+---+---+   +   +---+---+---+   +
|       |XXX|   |   |XXX|       |   |   |   |       |   |   |   |       |   |   |   |       |   |
+       +---+---+   +---+       +---+   +   +       +---+   +   +       +---+   +   +       +---+
|       |XXX|   |   |XXX|       |   |   |   |       |   |   |   |       |   |   |   |       |   |
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|       |       |   |       |       |   |       |       |   |       |       |   |       |       |
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+

Step 20             Step 21             Step 22             Step 23             Step 24
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|       |XXX|   |   |       |   |   |   |       |   |   |   |       |   |   |   |       |   |   |
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|   |   |XXX|   |   |   |XXX|XXX|   |   |   |       |   |   |   |       |   |   |   |       |   |
+---+---+---+   +   +---+---+---+   +   +---+       +   +   +---+       +   +   +---+       +   +
|   |       |   |   |   |       |   |   |   |       |   |   |   |       |   |   |   |       |   |
+   +       +---+   +   +       +---+   +   +---+---+---+   +   +---+---+---+   +   +---+---+---+
|   |       |   |   |   |       |   |   |   |XXX|XXX|   |   |   |   |XXX|XXX|   |   |   |       |
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|       |       |   |       |       |   |       |       |   |       |       |   |       |XXX|XXX|
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+

Step 25             Step 26             Step 27             Step 28             Step 29
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|       |   |   |   |       |   |   |   |       |   |   |   |       |   |   |   |       |   |   |
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|   |       |   |   |   |       |   |   |   |       |   |   |   |       |   |   |   |       |XXX|
+---+       +   +   +---+       +   +   +---+       +   +   +---+       +   +   +---+       +---+
|   |       |   |   |   |       |   |   |   |       |   |   |   |       |   |   |   |       |XXX|
+   +---+---+---+   +   +---+---+---+   +   +---+---+---+   +   +---+---+---+   +   +---+---+---+
|   |   |       |   |   |XXX|       |   |   |       |XXX|   |   |       |XXX|   |   |       |   |
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+   +
|XXX|XXX|       |   |   |XXX|       |   |   |XXX|       |   |   |       |XXX|   |   |       |   |
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+

Step 30             Step 31             Step 32             Step 33             Step 34
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|       |   |   |   |       |   |   |   |XXX|XXX|   |   |   |   |XXX|XXX|   |   |   |   |XXX|XXX|
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|   |XXX|       |   |XXX|XXX|       |   |       |       |   |       |       |   |       |       |
+---+---+       +   +---+---+       +   +---+---+       +   +---+---+       +   +---+---+       +
|   |XXX|       |   |   |   |       |   |   |   |       |   |   |   |       |   |   |   |       |
+   +---+---+---+   +   +---+---+---+   +   +---+---+---+   +   +---+---+---+   +   +---+---+---+
|   |       |   |   |   |       |   |   |   |       |   |   |   |       |   |   |   |       |   |
+---+---+---+   +   +---+---+---+   +   +---+---+---+   +   +---+---+---+   +   +---+---+---+   +
|   |       |   |   |   |       |   |   |   |       |   |   |   |       |   |   |   |       |   |
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+

Step 35             Step 36             Step 37             Step 38             Step 39
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|   |   |       |   |   |   |       |   |   |   |       |   |   |   |       |   |   |   |       |
+---+---+       +   +---+---+       +   +---+---+       +   +---+---+       +   +---+---+       +
|       |       |   |       |       |   |       |       |   |       |       |   |       |       |
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|   |   |XXX|XXX|   |   |XXX|   |XXX|   |   |XXX|   |   |   |   |XXX|   |   |   |   |XXX|   |   |
+   +---+---+---+   +   +---+---+---+   +   +---+---+   +   +   +---+---+   +   +   +---+---+   +
|   |       |   |   |   |       |   |   |   |       |   |   |   |       |   |   |   |       |   |
+---+---+---+   +   +---+---+---+   +   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|   |       |   |   |   |       |   |   |   |       |XXX|   |   |XXX|       |   |XXX|   |       |
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+

Step 40             Step 41             Step 42             Step 43
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|   |   |       |   |   |   |       |   |   |XXX|       |   |   |       |XXX|
+---+---+       +   +---+---+       +   +---+---+       +   +---+       +---+
|       |       |   |XXX|XXX|       |   |   |XXX|       |   |   |       |XXX|
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|XXX|XXX|   |   |   |       |   |   |   |       |   |   |   |       |   |   |
+---+---+---+   +   +---+---+---+   +   +---+---+---+   +   +---+---+---+   +
|   |       |   |   |   |       |   |   |   |       |   |   |   |       |   |
+   +---+---+---+   +   +---+---+---+   +   +---+---+---+   +   +---+---+---+
|   |   |       |   |   |   |       |   |   |   |       |   |   |   |       |
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+