121 232 343 454 565 676 787 898 1210 1232 2321 2343 3432 3454 4543 4565 5654 5676 6765 6787 7876 7898 8987 12321 12343 23210 23432 23454 34321 34543 34565 45432 45654 45676 56543 56765 56787 67654 67876 67898 78765 78987 89876
Note that non-ascii characters in the above source code will be escaped (such as \x9f).