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/// Factorial
///
/// # Type
/// : `usize -> usize`
///
/// # Usage
///
/// ```
/// extern crate peroxide;
/// use peroxide::*;
///
/// assert_eq!(factorial(5), 120);
/// ```
/// Permutation
///
/// # Usage
///
/// ```
/// extern crate peroxide;
/// use peroxide::*;
///
/// assert_eq!(P(5,3), 60);
/// ```
/// Combination
///
/// # Usage
///
/// ```
/// extern crate peroxide;
/// use peroxide::*;
///
/// assert_eq!(C(10, 9), 10);
/// ```
/// Combination with Repetition
///
/// # Usage
///
/// ```
/// extern crate peroxide;
/// use peroxide::*;
///
/// assert_eq!(H(5,3), C(7,3));
/// ```