On top of the `&`

and `|`

operators, you also learned about the `!`

operator, which negates a logical value. To refresh your memory, here are some R expressions that use `!`

. They all evaluate to `FALSE`

:

```
!TRUE
!(5 > 3)
!!FALSE
```

What would the following set of R expressions return?

```
x <- 5
y <- 7
!(!(x < 4) & !!!(y > 12))
```