@manwar Again, #RakuLang offers some #OneLiner solutions to the challenge:

Count Prefixes: ```
@array.map({$str.starts-with($_)}).sum
```

Valid Times: ```
([X~] .comb.map({ /\?/ ?? (0..9) !! $_})).grep(/^$<h>=[\d\d]\:$<m>=[\d\d]$ <?{ $<h> < 24 && $<m> < 60 }>/).elems
```

@manwar Again, #RakuLang offers some #OneLiner solutions to the challenge:

Alphabet Index Digit Sum: ```
( $str.trans(['a'..'z'] => [1..26]), *.comb.sum ... * )[$k]
```

Valid Token Counter: ```
.words.grep(/^ <:Ll>+ [ \- <:Ll>+ ]? <[,.!]>? $/).elems
```