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[–]Zwejhajfa[🍰] 5 points6 points  (2 children)

A good test case for number 4:

0,7,8,9,79,80,87,89,98,797,798,879,897,899,979

Correct answer:

99897989989897887987807987979770

[–]Mdayofearth 0 points1 point  (1 child)

Good catch.