.combination <- lavaSearch2:::.combination
.combination(1,1)
.combination(1:2,1:2)
.combination(c(1:2,1:2),1:2)
.combination(alpha = 1:2, beta = 3:4)
.combination(alpha = 1:2, beta = 3:4, gamma = 1:4)
.combination(alpha = 1:3, beta = 1:3, gamma = 1:3)
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