Hi, Any suggestions on how to do a decent test before sending in a solution for 4b? I think I am close to sending my first (of many I am sure ) attempts. I have tested it out with a bunch of random numbers, but it doesn't make me feel confident that this first attempt wouldn't be wasting a nitpickers time. Any suggestion other than testing all numbers between 0-999999999999? I figured others may have had the same problem before me.

a negative number zero a number from 1 and 9 ten a number from 13 to 19 twenty a multiple of 10 from 20 to 90 ninety nine one hundred a number from 101 to 109 a number from 113 to 119 one thousand something one hundred thousand fifty one billion 999,999,999,999 one trillion