How do you decompress a number string from this 68223031 to that 06 08 22 30 31?

Well, it really isn't hard.

First, divide all digits up in to groups of two, if one is left over, that's ok, like this, 68 22 30 31.

Now, knowing this is suppose to be a set of 5 acceding numbers, we can see 68 is out of order.

Next, divide the 68 in to two numbers, 6 and 8.

Last, add the leading zeros and tada, 06 08 22 30 31... Mathemagical.

Here's another one, 2673442.

Divide up, 2 67 34 42.

67 is out of order, so it becomes 2 6 7 34 42.

Add the leading zeros, tada, 02 06 07 34 42... Bob's Your Uncle.

Have fun.