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> math.between(0, 1) = 0.5
> math.between(0, 5) = 2.5
> math.between(8, 4) = 6
> math.between(3, 6) = 4.5
> math.between(8, 7) = 7.5
> math.between(0, 90) = 45
> 
> That is what I want

function math.between(x,y) return (x+y)/2 end