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I think you can look at its conjugate acid. If its conjugate acid is weaker then the base if stronger. So if you had two bases, look at both its conjugate acids and whichever conjugate acid is weaker, that base is stronger.
To add on, this effect is called the conjugate seesaw. The stronger the acid, the weaker its conjugate base and the stronger the base, the weaker its conjugate acid. We can derive this from the fact that we know [Ka][Kb]=10^-14. Therefore, as Ka increases, Kb must decrease and vice versa. The larger the Ka/Kb, the stronger the acid/base.
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