ACTIVITY

$4\mathrm{.}8\mathrm{.}1.$ Nested $1$oops.

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In Lou's postal service, each PO box is labeled with a letter followed by an integer. Given integers numRows and numColumns, output the label for each PO box, followed by a space. End each row with a newline.

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Note:

Rows are in alphabetical order. PO boxes in the first row all start with the letter A$.$

Columns are in ascending order. PO boxes in the first column all end with the integer $1.$

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