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Reasonably we can then assume there was a day zero (with no glyph incised on the tablet) at the beginning of side a - ordinal numbers cannot handle fractions and they must be left in darkness (but certainly alive as the inside of a closed clam sheell):

Not even today when counting down to rocket launchings are fractions of seconds used.

From these facts we can decuce that such a sum as 421

ARUKU KURENGA (B)
a1 47 47 b1 31 31
a2 40 87 b2 47 78
a3 37 124 b3 43 121
a4 40 164 b4 42 163
a5 43 207 b5 40 203
a6 44 251 b6 40 243
a7 43 294 b7 41 284
a8 46 340 b8 42 326
a9 49 389 b9 50 376
a10 32 421 b10 42 418
  b11 43 88 461
b12 45 506
sum 421 sum 506
Superficially: 421 + 506 = 927

could equally well be expressed as a more satisfactory (even number) integer *422. Both the G and the C texts were designed in this fashion. *422 + *418 = *840 days = *210 weeks. There were twice 21 assessors in the Egyptian Underworld.

Therefore the whole B text could cover 840 + 88 (two and twenty good four-wheeled wains) = 928 (= 2 * 464 = 32 * 29) right ascension days.

Although the different number of glyph lines on side a compared to that on side b might possibly indicate that side a should be regarded as a complete calendar text and side b as another such complete text. In which case a day zero could be also at the beginning of side b. *422 + *419 = *841 (= 29 * 29) right ascension days. 928 - 841 = 3 * 29 = 87.

And why not insert day zero on side b of the tablet instead at the begining of glyph line Bb11? The B text could then be regarded to cover approximatively *1 + *421 + *418 + *1 + *88 = *929 right ascension days. 260 + 1 = 9 * 29.

*88 (= 22 * 4 'wagon wheels') could be an allusion to 3 synodic months, i.e. to 3 * 29½ = *88½ notches as once upon a time were incised on the ancient mammoth bone. To describe 88 + the fraction around ½ the creator of the B text could have used both 88 and *89.