2 Wikipedia quoting tests:
4 (1) normal '''bold''' normal
6 (2) normal ''italic'' normal
8 (3) normal '''''bold italic''''' normal
10 (4) normal '''bold ''bold italic'' bold''' normal
12 (5) normal ''italic '''bold italic''' italic'' normal
14 (6) normal '''''bold italic'' bold''' normal
16 (7) normal '''''bold italic''' italic'' normal
18 (8) normal ''italic '''bold italic''''' normal
20 (9) normal '''bold ''bold italic''''' normal
22 (10) normal '''bold's''' normal
24 (11) normal ''italic's'' normal
26 (12) normal ''italic's '''bold's italic''' italic's'' normal
28 (13) normal '''''bold's italic'' bold's''' normal
30 (14) normal ''italic''' normal
32 (15) normal ''''bold''' normal
34 (16) normal ''italic'' normal ''italic'' normal
36 (17) normal ''italic'' normal '''bold''' normal
38 (18) normal '''bold''' normal '''bold''' normal
40 (19) normal '''bold''' normal ''italic'' normal