If you want to visualize it, imagine a piece of string of indeterminate length. Suspend it in the air so you can hang things on it.
To begin with, it is an empty string, or “”.
Then you thread a 2 onto it, and you’ve got a string of “2”.
Now you “add” a 1 by threading it on to the front of the string (or you could have started with the 1 and threaded the 2 onto the end of the string). Since you’ve added both letters to the string, the string now contains “12”.
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