What is the units digit of (44^4)(33^5)(21^6)

What is the units digit of (44^4)(33^5)(21^6)?

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #39187

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