stage,held_bc,input_years,ratio,years,later_bc,gain,role
Doubled input,14006,9660,1,9660,4346,0,Generated common coordinate
70/69 alternative,14006,9660,70/69,9800,4206,140,Matthew-side extended Adam opening
25/23 alternative,14006,9660,25/23,10500,3506,840,Noah closing / Shem opening