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Write a complete program in a module named SentinelSum with a Main subroutine that prompts the user for numbers until the user types -1, then outputs the sum of the numbers. Here is an example output:

Type a number: 10
Type a number: 20
Type a number: 30
Type a number: -1
Sum is 60
Function: Write a VB function as described, not a complete program.

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