By substituting 'f' with 'g' in the expression, you maintain the same term 'g' and replace 'f' with 'g', resulting in 'g g mr²'. This is equivalent to multiplying 'g' by itself, i.e., g² mr².
M. G. G. Pillai was born in 1939.
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M. G. Soman was born in 1941.
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G. M. Hirst was born in 1869.
M. G. Kelly was born in 1952.