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type RNG* = concept var rng
rng.randomUint32() is uint32
type MersenneTwister* = object
proc randomUint32*(self: var MersenneTwister): uint32 = 5
proc randomInt*(rng: var RNG; max: Positive): Natural = 5
var mersenneTwisterInst = MersenneTwister()
proc randomInt*(max: Positive): Natural =
mersenneTwisterInst.randomInt(max)
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