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How to rationalise the basicity order of phenylenediamine?

Why is the basicity of para- > meta- > aniline > ortho- for phenylenediamine?
($\mathrm pK_\mathrm a$: ortho: 9.53, meta: 9.12, para: 7.96) I tried deducing it using resonance and inductive effects but got stuck.

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