# 99 questions/80 to 89

(Difference between revisions)

This is part of Ninety-Nine Haskell Problems, based on Ninety-Nine Prolog Problems.

If you want to work on one of these, put your name in the block so we know someone's working on it. Then, change n in your block to the appropriate problem number, and fill in the <Problem description>,<example in lisp>,<example in Haskell>,<solution in haskell> and <description of implementation> fields.

## 2 Problem 80

<Problem description>

```Example:
<example in lisp>

```

Solution:

`<solution in haskell>`

<description of implementation>

## 3 Problem 81

<Problem description>

```Example:
<example in lisp>

```

Solution:

`<solution in haskell>`

<description of implementation>

## 4 Problem 82

<Problem description>

```Example:
<example in lisp>

```

Solution:

`<solution in haskell>`

<description of implementation>

## 5 Problem 83

<Problem description>

```Example:
<example in lisp>

```

Solution:

`<solution in haskell>`

<description of implementation>

## 6 Problem 84

<Problem description>

```Example:
<example in lisp>

```

Solution:

`<solution in haskell>`

<description of implementation>

## 7 Problem 85

<Problem description>

```Example:
<example in lisp>

```

Solution:

`<solution in haskell>`

<description of implementation>

## 8 Problem 86

<Problem description>

```Example:
<example in lisp>

```

Solution:

`<solution in haskell>`

<description of implementation>

## 9 Problem 87

<Problem description>

```Example:
<example in lisp>

```

Solution:

`<solution in haskell>`

<description of implementation>

## 10 Problem 88

<Problem description>

```Example:
<example in lisp>

```

Solution:

`<solution in haskell>`

<description of implementation>

## 11 Problem 89

<Problem description>

```Example:
<example in lisp>

`<solution in haskell>`