Primordial Incest in the book of Jubilees

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from www.pseudepigrapha.com/jubilees (Dates in square brackets are from that site.)

Book of Jubilees ch 4

1. And in the third week in the second jubilee [64-70 A.M.] she [Eve] gave birth to Cain, and in the fourth [71-77 A.M.] she gave birth to Abel, and in the fifth [78-84 A.M.] she gave birth to her daughter Âwân.
2. And in the first (year) of the third jubilee [99-105 A.M.], Cain slew Abel because (God) accepted the sacrifice of Abel, and did not accept the offering of Cain.
3. And he slew him in the field: and his blood cried from the ground to heaven, complaining because he had slain him.
4. And the Lord reproved Cain because of Abel, because he had slain him, and he made him a fugitive on the earth because of the blood of his brother, and he cursed him upon the earth.
5. And on this account it is written on the heavenly tables, 'Cursed is ,he who smites his neighbour treacherously, and let all who have seen and heard say, So be it; and the man who has seen and not declared (it), let him be accursed as the other.'
6. And for this reason we announce when we come before the Lord our God all the sin which is committed in heaven and on earth, and in light and in darkness, and everywhere.
7. And Adam and his wife mourned for Abel four weeks of years, [99-127 A.M] and in the fourth year of the fifth week [130 A.M.] they became joyful, and Adam knew his wife again, and she bare him a son, and he called his name Seth; for he said 'GOD has raised up a second seed unto us on the earth instead of Abel; for Cain slew him.'
8. And in the sixth week [134-40 A.M.] he begat his daughter Azûrâ.
9. And Cain took Âwân his sister to be his wife and she bare him Enoch at the close of the fourth jubilee. [190-196 A.M.] #And in the first year of the first week of the fifth jubilee, [197 A.M.] houses were built on the earth, and Cain built a city, and called its name after the name of his son Enoch.
10. And Adam knew Eve his wife and she bare yet nine sons.
11. And in the fifth week of the fifth jubilee [225-31 A.M.] Seth took Azûrâ his sister to be his wife, and in the fourth (year of the sixth week) [235 A.M.] she bare him Enos.
12. He began to call on the name of the Lord on the earth.
13. And in the seventh jubilee in the third week [309-15 A.M.] Enos took Nôâm his sister to be his wife, and she bare him a son in the third year of the fifth week, and he called his name Kenan.
14. And at the close of the eighth jubilee [325, 386-3992 A.M.] Kenan took Mûalêlêth his sister to be his wife, and she bare him a son in the ninth jubilee, in the first week in the third year of this week, [395 A.M] and he called his name Mahalalel.
15. And in the second week of the tenth jubilee [449-55 A.M.] Mahalalel took unto him to wife DinaH, the daughter of Barakiel the daughter of his father's brother, and she bare him a son in the third week in the sixth year, [461 A.M.] and he called his name Jared, for in his days the angels of the Lord descended on the earth, those who are named the Watchers, that they should instruct the children of men, and that they should do judgment and uprightness on the earth.
16. And in the eleventh jubilee [512-18 A.M.] Jared took to himself a wife, and her name was Baraka, the daughter of Râsûjâl, a daughter of his father's brother, in the fourth week of this jubilee, [522 A.M.] and she bare him a son in the fifth week, in the fourth year of the jubilee, and he called his name Enoch.