This is my suggestion:

rule 1. Only use numbers from 1 to 9.

rule 2. Begin at the center and continue towards the edge.

rule 3. Look at the middle of the line, there is a number 3 followed by a superscript '+2' so, the next number is a 5 because 3+2 equals 5. Moving along, you'll see that this number 5 is followed by a superscript ‘+9’, and then, the succeeding numbers 3 and 4 are now a 1 and a 4 since 5+9 equals 14.

What do you think?

Regards.

Interested in Language

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