Incorrect result

[yang170]

Data

a a b c a c
a d c b c a
e f a b d f

Running prefixspan-cli frequent 3 --text fmt-db1.txt gives me

e : 3
e e : 3
e b : 3
b : 3

[feng-1985]

replace with numbers, you can get the correct results
cat fmt-db1.txt
1 1 2 3 1 3
1 4 3 2 3 1
5 6 1 2 4 6

prefixspan-cli frequent 3 fmt-db1.txt
1 : 3
1 2 : 3
2 : 3

or use python

from prefixspan import PrefixSpan

db = [
... ['a','a','b','c','a','c'],
... ['a','d','c','b','c','a'],
... ['e','f','a','b','d','f']
... ]

ps = PrefixSpan(db)

print(ps.frequent(3))
[(3, ['a']), (3, ['a', 'b']), (3, ['b'])]