from research import *
s=begin(536,'Equal lives preserve birth and death displacement','Which161 equality is forced by the supplied biographies?',{'Ishmael':[1865,1728],'Levi':[1704,1567],'terminal':1406},['File60 §§3.1–3.2'])
finish(s,{'lifespans':[1865-1728,1704-1567],'birth_gap':1865-1704,'death_gap':1728-1567,'terminal_arm':1567-1406,'identity':'(B1−L1)−(B2−L2)=(B1−B2)−(L1−L2)'},
 'Equal137-year lives force equal161 birth/death displacement. The further161 from Levi’s death to the terminal is an additional source placement. Separating these two facts avoids treating the biography rectangle as several independent alignments.',
 'Reconstruct the bilateral spine and its expansion with a single held midpoint.',{'equal_lives':1865-1728==1704-1567==137,'gap':1865-1704==1728-1567==161,'terminal':1567-1406==161})