How do I convert gray code to binary?！

The conversion from gray code to binary is simple. Step 1: Write the number down and copy the left most digit under itself. Step 2: Add the highlighted binary digit to the gray code immediately up and to the right of it. So, 1 plus 1 is 0 dropping the carried digit. Write the result next to the binary digit just added. Drop all of the carried digits.
Step 3: Repeat Step 2 until the number is COMPLETED

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