Works for arrays and seq as well:

[| yield 1; yield! [|2;3|]; yield 4 |]
seq { yield 1; yield! seq { 2; 3 }; yield 4 }

For part 1 didn't bother to merge (given the data size linear search sufficiently fast).

For part 2 I sorted, as it makes working out then two ranges do not overlap trivial: vast majority of edge cases disappear.
Problem was trying to use fixed size collections when removing items. Linked list FTW.

Time to check again.... Aus are now 31-4 🤯

Coincidentally, this morning saw this. Witch trials were indeed across most of Europe: bird.makeup/users/amazin...

"I am never lost; the world is displaced around me".

HHGttG... but in its original form: the two radio series. Whole sections didn't make it into the books (largely because Douglas Adams didn't want to credit John Lloyd for the co-written episodes).

OK, so not just me! :-)

F# in its interactive form; plus there is a REPL `dotnet fsx`: learn.microsoft.com/en-us/dotnet...

AIUI yes, but don't have an easy reference to confirm details. Buzzards have a somewhat squarer wing. Around here N. Hampshire buzzards are pretty common; but not sure I've ever seen a kite.

I would guess a buzzard: pretty common even in more urban areas.