They were in 10 episode lots (in production order) until the final set, which was the final 18.
The first lot was episodes 2-11, then 12-21, 22-31, 32-41, 42-51, 52-61 and 62-79
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I dunno. I recall distinctly that while the production order numbers were indicated on the box spines, the groups released were in airdate order.