 1 /(?<!a)c/i      "ac"  []
 2 /(?<!a)c/i      "aac" []
 3 /(?<!a)c/i      "Aac" []
 4 /(?<!a)c/i      "aAc" []
 5 /(?<!a)c/i      "AAc" []
 6 /(?<!a|b)c/i    "ac"  []
 7 /(?<!a|b)c/i    "aac" []
 8 /(?<!a|b)c/i    "Aac" []
 9 /(?<!a|b)c/i    "aAc" []
10 /(?<!a|b)c/i    "AAc" []
11 /(?<!aa)c/i     "ac"  ["c"]
12 /(?<!aa)c/i     "aac" []
13 /(?<!aa)c/i     "Aac" []
14 /(?<!aa)c/i     "aAc" []
15 /(?<!aa)c/i     "AAc" []
16 /(?<!aa|b)c/i   "ac"  ["c"]
17 /(?<!aa|b)c/i   "aac" []
18 /(?<!aa|b)c/i   "Aac" ["c"]
19 /(?<!aa|b)c/i   "aAc" ["c"]
20 /(?<!aa|b)c/i   "AAc" ["c"]
21 /(?<!b|aa)c/i   "ac"  ["c"]
22 /(?<!b|aa)c/i   "aac" []
23 /(?<!b|aa)c/i   "Aac" []
24 /(?<!b|aa)c/i   "aAc" []
25 /(?<!b|aa)c/i   "AAc" []
26 /(?<!aa|bb)c/i  "ac"  ["c"]
27 /(?<!aa|bb)c/i  "aac" []
28 /(?<!aa|bb)c/i  "Aac" []
29 /(?<!aa|bb)c/i  "aAc" []
30 /(?<!aa|bb)c/i  "AAc" []
