What I meant was each series had its own sheet of 264 cards. The question is why, at least for the first three series, the sheets exist in 2 different configurations. One config has two different slits, with 66 cards printed twice on one slit and the other slit contains the rest of the 132 cards. The 2nd config has all 132 cards on one slit, with presumably, an identical 2nd slit.
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