Nothing

```
context("Combination")
test_that("Combination", {
I <- iterpc(5, 3, ordered = FALSE)
getnext(I)
expect_that(getnext(I)[3], equals(4))
expect_that(getcurrent(I)[3], equals(4))
expect_that(nrow(getall(I)), equals(10))
I <- iterpc(3, 3, labels = c("a", "b", "c"), ordered = FALSE)
getnext(I)
expect_that(getnext(I)[3], equals(NULL))
I <- iterpc(3, 2, ordered = FALSE)
expect_that(nrow(getall(I)), equals(3))
I <- iterpc(c(2, 2), 2, labels = c("a", "c"), ordered = FALSE)
getnext(I)
expect_that(getnext(I)[2], equals("c"))
expect_that(nrow(getall(I)), equals(3))
I <- iterpc(c(2, 2, 0), 2, labels = c("a", "b", "c"), ordered = FALSE)
expect_that(nrow(getall(I)), equals(3))
I <- iterpc(5, 3, ordered = FALSE, replace = TRUE)
getnext(I)
expect_that(getnext(I), equals(c(1, 1, 2)))
expect_that(nrow(getall(I)), equals(35))
I <- iterpc(5, 5, ordered = FALSE)
expect_that(nrow(getall(I)), equals(1))
I <- iterpc(5, 1, ordered = FALSE)
expect_that(nrow(getall(I)), equals(5))
I <- iterpc(5, 5, labels = 1:5, ordered = FALSE)
expect_that(nrow(getall(I)), equals(1))
I <- iterpc(5, 1, labels = 1:5, ordered = FALSE)
expect_that(nrow(getall(I)), equals(5))
I <- iterpc(5, 1, labels = 1:5, ordered = FALSE)
expect_that(nrow(getall(I)), equals(5))
I <- iterpc(1, 1, ordered = FALSE)
expect_that(nrow(getall(I)), equals(1))
getnext(I)
expect_that(getnext(I), equals(NULL))
})
```

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