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:library(tidyverse)
mtcars %>% as_tibble %>% group_by(vs, am) %>% count %>% print
#> # A tibble: 4 x 3
#> # Groups: vs, am [4]
#> vs am n
#> <dbl> <dbl> <int>
#> 1 0 0 12
#> 2 0 1 6
#> 3 1 0 7
#> 4 1 1 7