1 1 (IL on line 2, expect nothing)
2 2 (DL on line 22, expect nothing)
3 3 vvvv IL on line 5, expected: A_BC
9 9 vvvv DL on line 11, expected: ACD_
15 15 vvvv IL on line 17, expected: A_
19 19 vvvv IL on line 21, expected: A_
23 23 vvvv IL on line 24, expected: _A
25 \e[L
\e[22d
\e[M
\e[5d
\e[L
\e[10;13r
\e[11d
\e[M
\e[16;17r
\e[17d
\e[L
\e[20;21r
\e[21d
\e[M
\e[r
\e[24d
28 27 vvvv DL on line 28, expected: B_
33 32
\e[16;17r
\e[16d
\e[L
\e[20;21r
\e[20d
\e[M
\e[r
\e[24d