Better for your eyes and no mistake:

0 and O (big O not zero)
no l (small L)
no I (big i)
but has 1 (One)

9 TO dot ONE
9 .壹
[0] Shortened Permanent Link will last forever. like
[1] Memorable link will only last for 9 days 9 hours 9 mins and 9 seconds. like
[2] Memorable link can be Chinese PinYin (拼音) of the word.
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