Don’t think I would remember the long number Tabs, not with the expiry date and CV number too.
You do well. 
LOL - way back in my misspent youth, Mups, I was trained by the GPO as a telephonist - since when numbers just seem to stick in my memory.
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we can probably all remember some telephone numbers so learning a 16 digit number and the other cvc number would simply be like learning two more. On which point how often do you find it difficult when someone reads your number back to you because they pause in different places and ding a slightly different rhythm?
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