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well, in their defense, if they only had one register open, and it was tied up, they couldn't have rang you up.
HOwever, once you gave the $10, they should have said "no problem sir, we're sorry for the delay, enjoy your strings." and allowed you to leave.
If that place is convenient, go back and get some strings. Likely, they won't have computer issues two times in a row. You need strings. They have strings. Problem solved.
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