[AnimalMuppet]

But you need to also include the number of prepositions. "A pelican on a bicycle" is not at all the same as "a pelican inside a bicycle".

There are estimated to be 100 or so prepositions in English. That gets you to 4 trillion combinations.

[jodrellblank]

The prompt was "a pelican riding a bicycle"; not prepositions but every verb. Potentially every adverb+verb combination - "a pelican clumsily pushing a bicycle"