What I meant is that how the question is phrased 'what causes sex (=m/f) differences?' presupposes a binary notion of gender (male, female).
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"These...clocks use the dozenal number base, which requires ten and eleven to be single digits. On the diurnal clocks, the slowest hand..."
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"..circles the clock face once a day. Each of the other hands moves a dozen times faster than the next slower one." http://dozenal.ae-web.ca/pdf/about-short.pdf …
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Wasn't obvious

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Ah, upside down numerals for 10 & 11...
End of conversation
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