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AZW is essentially identical to MOBI. AZW1 or TPZ is TOPAZ, which is a Kindle-only format. Note that in some Kindle apps, TOPAZ is stored in .azw (or even .prc).
It is possible to use a 3rd-party plugin to Calibre that strips DRM from TOPAZ and then Calibre can format shift to MOBI or ePub. However, the conversion is based on the OCRed scan in the TOPAZ and the results are of variable quantity/
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