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I believe thats about right for your tyre age and allocation.
Just need to work it out what is actually there IF the 3 tyre change and 20/22 lap limits are.
PRESUMING everyone runs mediums for the sprint your left with this:
Now PRESUMING that the FIA say its 3 mandatory tyre change stops. 59 / 4 (stints) leaves you with 14.75 laps for each tyre. Lets make it 15 for numbers sake.
So any tyre with over 7 laps would not be eligible to race, which leaves your allocation as follows:
Maximum available laps left per tyre.