Identify the free and dummy indices in the following equations and change them into equivalent expressions with

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Identify the free and dummy indices in the following equations and change them into equivalent expressions with different indices. How many different equations does each expression represent?
(a) AαBα = 5;
(b) A = ⋀vAv
(c) TαμλAμCλγ = Dγα;
(d) Rμν - 1/2gμνR = Gμν.
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