Off with of

"Is this the fastest car of ever?", asked Dominic. 

He has this peculiar expression: "of ever", which he uses to mean "ever".  "This is the biggest house of ever!"

Daddy: You don't need to say "of".  Just say "ever"

Dominic: (tries out the new phrasing) The fastest car...ever. 

Doesn't like it.

Dominic: (glum) But I like 'of'.  Don't tell me I cannot say 'of'.

Daddy: Ok.

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