1 If John didn't oversleep, he wouldn't be late for work.
2 If he wasn't late for work, his boss wouldn't fire him.
3 If John didn't lose his job, he wouldn't walk in the street in the afternoon.
4 If he didn't walk in the street, he wouldn't see the travel agency lottery.
5 If he didn't see the lottery, he wouldn't win the tour to Egypt.
6 If he didn't win the tour to Egypt, he wouldn't go sightseeing.
7 If he didn't go sightseeing, he wouldn't get acquainted with the people from New York who offered him a job there.
8 If he didn't get acquainted with them, he wouldn't work as the head manager of the bank.
9 If he didn't work as the head manager of the bank he wouldn't be happy and he wouldn't have money at all.