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Pairs. Some of the functions here are also exposed in `Pervasives`, as documented below.

`type ('a, 'b) t = 'a * 'b`
`val make : 'a -> 'b -> 'a * 'b`
`val first : ('a * 'b) -> 'a`
`val second : ('a * 'b) -> 'b`
`val swap : ('a * 'b) -> 'b * 'a`
`val map : ('a -> 'c) -> ('b -> 'd) -> ('a * 'b) -> 'c * 'd`

Equivalent to `BatPervasives`.(***).

`val mapn : ('a -> 'b) -> ('a * 'a) -> 'b * 'b`

Like `map` but specialized for tuples with elements of the same type.

`mapn f` is equivalent to `map f f`.

`val map1 : ('a -> 'c) -> ('a * 'b) -> 'c * 'b`

`map1 f (x,y)` returns (f x,y)

`val map2 : ('b -> 'c) -> ('a * 'b) -> 'a * 'c`

`map2 f (x,y)` returns (x,f y)

`val curry : (('a * 'b) -> 'c) -> 'a -> 'b -> 'c`
`val uncurry : ('a -> 'b -> 'c) -> ('a * 'b) -> 'c`
```val print : ?first:string -> ?sep:string -> ?last:string -> ('o BatIO.output -> 'a -> unit) -> ('o BatIO.output -> 'b -> unit) -> 'o BatIO.output -> ('a * 'b) -> unit```
```val printn : ?first:string -> ?sep:string -> ?last:string -> ('o BatIO.output -> 'a -> unit) -> 'o BatIO.output -> ('a * 'a) -> unit```
```val compare : ?cmp1:('a -> 'a -> int) -> ?cmp2:('b -> 'b -> int) -> ('a * 'b) -> ('a * 'b) -> int```
`include BatEnum.Enumerable with type 'a enumerable = 'a * 'a`
`type 'a enumerable = 'a * 'a`

The data structure, e.g. `'a List.t`

`val enum : 'a enumerable -> 'a BatEnum.t`

Return an enumeration of the elements of the data structure

`val of_enum : 'a BatEnum.t -> 'a enumerable`

Build a data structure from an enumeration

`val eq : 'a BatOrd.eq -> 'b BatOrd.eq -> ('a * 'b) BatOrd.eq`
`val ord : 'a BatOrd.ord -> 'b BatOrd.ord -> ('a * 'b) BatOrd.ord`
`val comp : 'a BatOrd.comp -> 'b BatOrd.comp -> ('a * 'b) BatOrd.comp`
```module Eq (T1 : BatOrd.Eq) (T2 : BatOrd.Eq) : BatOrd.Eq with type t = T1.t * T2.t```
```module Ord (T1 : BatOrd.Ord) (T2 : BatOrd.Ord) : BatOrd.Ord with type t = T1.t * T2.t```
```module Comp (T1 : BatOrd.Comp) (T2 : BatOrd.Comp) : BatOrd.Comp with type t = T1.t * T2.t```