# Changeable words

```ruby
var file = File("unixdict.txt")

if (!file.exists) {
    require('LWP::Simple')
    say ":: Retrieving #{file} from internet..."
    %S<LWP::Simple>.mirror(
        'https://web.archive.org/web/20180611003215if_/' +
        'http://www.puzzlers.org:80/pub/wordlists/unixdict.txt',
    'unixdict.txt')
}

var words  = file.read.words
var bucket = Hash()
var count = 0

words.each {|word|

    var len = word.len

    len > 11 || next
    bucket{len} := []

    bucket{len}.each{|prev|
        if (prev ^ word -> count("\0") == len-1) {
            printf("%2d: %20s <-> %s\n", ++count, prev, word)
        }
    }
    bucket{len} << word
}
```

## Output:

```
 1:         aristotelean <-> aristotelian
 2:       claustrophobia <-> claustrophobic
 3:         committeeman <-> committeemen
 4:       committeewoman <-> committeewomen
 5:        complementary <-> complimentary
 6:         confirmation <-> conformation
 7:        congresswoman <-> congresswomen
 8:         councilwoman <-> councilwomen
 9:         craftsperson <-> draftsperson
10:         eavesdropped <-> eavesdropper
11:         frontiersman <-> frontiersmen
12:       handicraftsman <-> handicraftsmen
13:         incommutable <-> incomputable
14:         installation <-> instillation
15:         kaleidescope <-> kaleidoscope
16:         neuroanatomy <-> neuroanotomy
17:         newspaperman <-> newspapermen
18:         nonagenarian <-> nonogenarian
19:         onomatopoeia <-> onomatopoeic
20:         philanthrope <-> philanthropy
21:         prescription <-> proscription
22:        schizophrenia <-> schizophrenic
23:        shakespearean <-> shakespearian
24:         spectroscope <-> spectroscopy
25:        underclassman <-> underclassmen
26:        upperclassman <-> upperclassmen
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://trizen.gitbook.io/sidef-lang/programming_tasks/c/changeable_words.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.