Assuming Leaders are Person1 and Person2, you need to calculate the sum of those binary variables and constraint it to be <= 1, for each Task, e.g.
SUM(C13:C14) <= 1.
Same reasoning goes for newbies.
Extra: yes, there is. In M13
=SUMPRODUCT(C4:G4,C13:G13)
HTH,
Francesco
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