The Easiest way to check if one array is a subset of another

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I want to find the easiest way if one array is a subset of another

for example

 A                    b
[1,2,4,5,6,7,9]      [1,3,9] =>true

 A                    b
[1,2,4,5,6,7,9]      [1,3,8] =>false
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