Proving $R(m + 1, n) \geqslant R(m, n)$ for all $m, n \geqslant 2$

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Is the Ramsey number $R(m + 1, n) \geqslant R(m, n)$ for all $m, n \geqslant 2$? Briefly justify your answer.

Can anyone help me with this please? Many thanks.