HOW DO U DO?
Credit: GAMES Magazine - Oct. 2005
Ralph Maus

The letter U is the rarest of the five English vowels, occurring just one-quarter as often as the most frequent letter, E. This rarity makes it all the more surprising to find so many words containing two U's, separated by another letter. Listed below are all 26 U-letter-U trigrams (UAU, UBU, UCU, etc.). Can you place one or more letters before, after, or both before and after the U-letter-U trigrams to form common, uncapitalized words. At least 20 of the 26 combinations have answers.

For example, the clue _____UAU_____could be answered with LUAU. The clue _____USU_____ could be answered with USURY. And the clue _____UTU_____ could be answered with FUTURE.

_____UAU_____               _____UNU_____
_____UBU_____               _____UOU_____
_____UCU_____               _____UPU_____
_____UDU_____               _____UQU_____          
_____UEU_____               _____URU_____
_____UFU_____               _____USU_____
_____UGU_____              _____UTU_____
_____UHU_____              _____UUU_____
_____UIU_____                _____UVU_____
_____UJU_____                _____UWU_____
_____UKU_____              _____UXU_____
_____ULU_____              _____UYU_____
_____UMU_____             _____UZU_____

(Possible) Answers:

LUAU                                UNUSUAL
SUBURB                           CONTINUOUS
CUCUMBER                    SCRUPULOUS
FRAUDULENT                BOUQUET
QUEUE                              GURU
no UFU                               USUAL
AUGUR                              MUTUAL
no UHU                               no UUU
COLLOQUIUM                UVULA
JUJUBE                              no UWU
UKULELE                         LUXURY
PENDULUM                     no UYU
CUMULATIVE                 no UZU    

Alternate answers:
UBU - AUBURN
UGU - FUGUE - LUGUBRIOUS
ULU - ULULATE
UMU - CUMULUS
UOU -  INNOCUOUS