Pumping lemma and CFG

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I am solving problem in pumping lemma for context-free languages. I want to ask a hint for the following problem

$$L=\big\{www:w\in\{a,b\}^*\big\}$$

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HINT: If $p$ is the pumping length, try starting with the word $w=a^{p-1}ba^{p-1}ba^{p-1}b$.