Test.assertEquals(sum10("arrb6???4xxbl5???eee5abc"), true)
Test.assertEquals(sum10("abc6? ?4"), false)
Test.assertEquals(sum10("no digit no pair"), false)
Test.assertEquals(sum10("1 digit still no pair"), false)
Test.assertEquals(sum10("2 digits but no question marks still no pair 8"), false)
Test.assertEquals(sum10("1"), false)
Test.assertEquals(sum10("1???9"), true)
Test.assertEquals(sum10("1????9"), false)
Test.assertEquals(sum10("1??????9"), false)
Test.assertEquals(sum10("1x?x?x?9"), true)