Two errors in the example

Good day. Forgive my poor English. There are two errors in the example. First of all. The number 9 is repeated in the first and second sums. Secondly. The number 42 can be expressed in five sums, not four: a) 5+6+7+8+16 (b) 9+10+11+12 c) 13+14+15 d) 20+22 e) 42