Add -er for the comparative and -st for the superlative.
Use the comparative with dan (rijker dan…) and the superlative with het (het rijkste).
The comparative (vergrotende trap) of rijk is rijker. Add -er for the comparative and -st for the superlative. Use it with 'dan': ...rijker dan...
The superlative (overtreffende trap) of rijk is rijkst, usually used as het rijkste.
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