> For the complete documentation index, see [llms.txt](https://trizen.gitbook.io/sidef-lang/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://trizen.gitbook.io/sidef-lang/programming_tasks/a/anadromes.md).

# Anadromes

```ruby
var S = Hash()
 
File('words.txt').open_r.each {|word|
    word.len > 6 || next
    if (S.has(word.flip)) {
        say "#{word.flip} <=> #{word}"
    }
    else {
        S{word} = true
    }
}
```

#### Output:

```
amaroid <=> diorama
gateman <=> nametag
deifier <=> reified
leveler <=> relevel
deviler <=> relived
degener <=> reneged
relever <=> reveler
deliver <=> reviled
reliver <=> reviler
redrawer <=> rewarder
dioramas <=> samaroid
revotes <=> setover
sallets <=> stellas
reknits <=> stinker
desserts <=> stressed
pat-pat <=> tap-tap
dessert <=> tressed
```