QA output created by 305
"" "" true
"" "a" false
"" "ab" false
"" "ab cd" false
"" "ab de" false

"a" "" false
"a" "a" true
"a" "ab" false
"a" "ab cd" false
"a" "ab de" false

"ab" "" false
"ab" "a" false
"ab" "ab" true
"ab" "ab cd" true
"ab" "ab de" true

"ab cd" "" false
"ab cd" "a" false
"ab cd" "ab" true
"ab cd" "ab cd" true
"ab cd" "ab de" true

"ab de" "" false
"ab de" "a" false
"ab de" "ab" true
"ab de" "ab cd" true
"ab de" "ab de" true
