Script

import json
import re

path = 'F:\\wikititle\\wiki3.txt'
i = open(path, encoding="utf-8")
var=i.read()
list2 = re.findall("[^a-zA-Z0-9]([a-zA-Z]{4}_[a-zA-Z]{6|7})[^a-zA-Z0-9]",var)
list2 = list2.split()
seen = set()
uniq = [x for x in list2 if x not in seen and not seen.add(x)]

f = open('F:\\wikititle\\kidsb.txt','x')
f.write(json.dumps(uniq))
f.close()
print("done")