its easyer to make two runs
split the neborhood in two leave around 6 for the first half and 9 for the second half
that way you can hit alot of houses early but still get all the left over candie from the late houses
Sounds logical.
I also recomend emptying your candy into a seperate bag before each house. It makes it look like you have no candy, and you are likely to get more.
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