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## lcm
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### Instructions
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Write a function, `lcm`, that returns least common multiple.
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It will be tested with positive `int` values and `0`.
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### Expected function
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```go
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func Lcm(first, second int) int {
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}
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```
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### Usage
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Here is a possible program to test your function :
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```go
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package main
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func main() {
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fmt.Println(Lcm(2, 7))
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fmt.Println(Lcm(0, 4))
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}
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```
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### Output
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```console
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student@ubuntu:~/[[ROOT]]/test$ go build
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student@ubuntu:~/[[ROOT]]/test$ ./test
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14
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0
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student@ubuntu:~/[[ROOT]]/test$
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```
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