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The American professor is the perenially upbeat Professor Longhair, which gives us LONG.
Freddie (the manically grining bespectacled leader) pulled down the shorts of the Dreamers (alright, alright, I was wrong to say combinations) as part of the routine for the song Short Shorts, enshrined in the film What a Crazy World, which gives us SHORT.
If you are "furnished" with a boy, that has to be a tallboy, ie a dresser, giving us TALL.
"Thrice blessed" as in the lyrics of the wartime song:
Bless 'em all, bless 'em all,That all seems perfectly logical and reasonable to me.
The long and the short and the tall.