# [plt-scheme] Re: Word permutations - with a slight twist

 From: Noel Welsh (noelwelsh at yahoo.com) Date: Thu Jan 18 16:18:55 EST 2007 Previous message: [plt-scheme] Re: Word permutations - with a slight twist Next message: [plt-scheme] Word permutations - with a slight twist Messages sorted by: [date] [thread] [subject] [author]

```--- wooks <wookiz at hotmail.com> wrote:

> Just a little more help please.
>
> What would the one-step permutations be for my case where
> I am given
>
> '(aa b)
>
> but have to generate 4 letter words. Thats a bit more
> complex than your
> example and I wish to solidify what you mean by a 1 step
> permutation.

Forget about the 4 letter restriction for now -- that's a

For now try to solve this:

Given two lists of symbols, one being the permutations
already generated (list A), and one being the symbols that
form the permutations (list B), generate the list of
symbols that consist of all the permutations of list B
appended to the elements of list A.

Example

(one-step-permutations '(a b c) '(x y))

=>

'(ax ay bx by cx cy)

HTH,
Noel

Email: noelwelsh <at> yahoo <dot> com   noel <at> untyped <dot> com
AIM: noelhwelsh
Blogs: http://monospaced.blogspot.com/  http://www.untyped.com/untyping/

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```

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