from research import *
s=begin(809,'Resolve the NT head-role dependence','Would the birth-hinge head produce the same BJ duration?',{},['File43 Matthew birth-hinge2806 versus envelope2876'])
birth=6+40*70;envelope=birth+70;luke=6+76*70
finish(s,{'birth_head':birth,'envelope_head':envelope,'Luke_minus_birth':luke-birth,'Luke_minus_envelope':luke-envelope,'role_effect':70},'Using Matthew’s birth head gives2520; its head envelope gives2450. The interface therefore depends on an explicit source role, just as the BJ2450/2400 comparison depends on Creation/Fall roles.','Specify which operations explain the BJ families and which source choices remain inputs.',{'birth2520':luke-birth==2520,'envelope2450':luke-envelope==2450})