Write a recursive function called print_num_pattern() to output the following number pattern.

Given a positive integer as input (Ex: 12), subtract another positive integer (Ex: 3) continually until 0 or a negative value is reached, and then continually add the second integer until the first integer is again reached.

For coding simplicity, output a space after every integer, including the last. Do not end output with a newline.

Ex. If the input is:

12
3
the output is:

12 9 6 3 0 3 6 9 12
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