S₁ : On 5th October, 1818, when young Lincoln was approaching his 10th years, his mother Nancy died of fever.
S₆ : His total education at school comprised only about a year during which he, however, managed to master reading, writing, spelling and some arithmetic.
P : She was illiterate, but she brought with her several books, among which were Pilgrim’s Progress, Sindbad the Sailor, Robinson Crusoe and Aesop’s Fables.
Q : Lincoln always acknowledged this moral and intellectual debt to his step mother.
R : The following year, his father married Sarah Bush Johnson, a widow with three children.
S : These books provided Lincoln with a mass of knowledge.
The correct sequence should be