s851.py

from research import *
s=begin(851,'Close the first twenty-step explanatory checkpoint','What did the complete list holdout add to the common grammar?',{},['C832–850'])
doc='# Chronological families: checkpoint C851\n\nTwenty sequential actions are complete. File58 extends the source-path model to categorized lists. The new work recovers complete fields and identifies which information their totals retain.\n\nThe Tishri matrix has two280 margins, but a cell circulation can preserve both while changing the source entries. Esau’s joint purity/sex table is[[440,50],[50,10]]: its equal490/60 marginals require the single off-diagonal balance50=50, without identifying the classifications. The four margin measurements have rank3 on nine source counts.\n\nThe whole forward/reverse festival paths arise from the declared8-part sequence. Their common prefix counts are exactly0,59,140,199, explaining the shared1859/1446/879/466 labels at different step positions. Source order, category order and scaling have now been separated explicitly.\n\nThe female400/430/470/490 register requires changing endpoint pairs; it is not one fixed-anchor walk. The household33/16/14/7 example shows how ordered prefixes recover distinctions lost by two regroupings.\n\nThese are mathematical explanations of source-controlled constructions. Textual selection, animal-year interpretation and historical design remain distinct premises. No primer or canonical source was opened for amendment.\n\nNext: latest File52c’s complete32-source paired-anchor displacement field, retaining only its64 existing one-pass endpoints and excluding target tallies.\n'
a=artifact('deliverables/490d_Chronological_Families_Checkpoint_C851.md',doc)
finish(s,{'checkpoint':a},'The first transfer succeeds with one explicit enrichment: category predicates and declared order remain attached to source rows. Equal totals are now traced to exact constraints rather than treated as interchangeable objects.','Reconstruct the full paired-anchor field from its original digit registers.',{'twenty':851-832+1==20})