How to replace placeholder in string with different value if more placeholders exist?

arr = [1,2,3,4,5,6,7]
val = ? (3 different values from arr)
result = "${val} and ${val} and ${val}"

I want to replace ${val} with arr elements such that ${val} will not be same in result.

I seriously don't have idea how to replace different values in place of ${val}

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