1-first grade

[l.s.]
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mr. styles and mr. tomlinson are both teachers; mr. styles deals with 1st graders while mr. tomlinson teaches at Queens University. they have never crossed paths before mr. tomlinson took his child development class on a field trip to Queens Elementary to see how classes are taught.

but rather than observing the kids as told to, mr. tomlinson has his eyes on someone a little older than the first graders.
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OR
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au where harry sings at a bar on tuesday's and thursday's and is an elementary school teacher; louis is a college professor and plays football (soccer) and coaches the middle school team.