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There's also the fact that people will think of what they want first as that is their need, where they want it is secondary (i.e. the common 'what' or 'where' that changes for a single user over time is the 'what' - the 'where' is almost always their locality so that user will automatically think that the most significant part of their search is the 'what'). This logic can often be reversed when you think about people travelling outside of their locality, often people will then see the 'where' as more important - hence you will see 'where what' searches often for travel.
Institutions could be banks, taxis, etc, so you tend to see more of "London taxis" than "taxis in London". You do see "taxis London" but there are not as many searches for this layout.
Back when the Overture tool was working (buggily), I used to see actual alphabetised searches in the logs such as "estate real sydney" -- not that precise term but ones like those. From time to time, Yahoo used to display the words in alphabetical order and I think some novice SEOs took them as gospel.