Is this a valid supplement to my Japanese learning program? Looks effective so I bought a pack. Wondering if there is some evidence behind it or am I wasting my time.

I just bought these. https://www.amazon.com/gp/product/B0CQHZZVD1 They haven't arrived yet but curious to know what some seasoned Japanese learners thought. FYI, I'm just at N5.

by bsmithysed

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