Nothing
assign_groups(100, c(0.5,0.5), c(0.4,0.3,0.3), c(0.1,0.2,0.7), 1,
.rng_kind = "Xoshiro256+")
assign_groups(100, c(0.5,0.5), c(0.4,0.3,0.3), c(0.1,0.2,0.7), 1,
.rng_kind = "Mersenne-Twister")
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