26         { str1: 'apple', str2: 'apple' },  property
27         { str1: 'apple', str2: 'banana' },  property
28         { str1: 'banana', str2: 'apple' },  property
29         { str1: 'app', str2: 'apple' },  property
30         { str1: 'application', str2: 'apple' },  property
31         { str1: 'Apple', str2: 'apple' },  property
32         { str1: '123', str2: '1234' },  property
33         { str1: '1234', str2: '123' },  property
34         { str1: 'Zebra', str2: 'apple' },  property
35         { str1: 'appleappleappleappleappleapple', str2: 'appleappleappleappleappleapple' },  property
36         { str1: 'appleappleappleappleappleapple', str2: 'appleappleapplebppleappleapple' },  property
37         { str1: 'appleappleappleAppleappleapple', str2: 'appleappleappleappleappleapple' },  property
39         { str1: 'appleappleapple'.substring(0, 5), str2: 'appleappleapple'.substring(5, 10) },  property
40         { str1: 'appleappleapple'.substring(1, 6), str2: 'appleappleapple'.substring(6, 11) },  property
41         { str1: 'appleappleapple'.substring(0, 5), str2: 'appleappleapple'.substring(10, 15) },  property
42         { str1: 'appleappleapple'.substring(0, 5), str2: 'appleappleapple'.substring(5, 11) },  property
44         { str1: 'HelloWorld', str2: 'Hello'.concat('World') },  property
45         { str1: 'Ni'.concat('Hao', 'Ya'), str2: 'NiHaoYa' },  property
46         { str1: 'HelloWorld', str2: 'Hello'.concat('World ') },  property
47         { str1: 'Ni'.concat('Hao', 'Ya', '1'), str2: 'NiHaoYa' },  property
49         { str1: 'Hell'.concat('oWorld'), str2: 'Hello'.concat('World') },  property
50         { str1: 'Ni'.concat('Hao', 'Ya'), str2: 'NiHao'.concat('Ya') },  property
51         { str1: 'Hello'.concat('a'), str2: 'Hello'.concat('b') },  property
52         { str1: 'Ni'.concat('Hao', '8'), str2: 'NiHao'.concat('7') },  property
54         { str1: 'appleappleapple'.substring(5, 10), str2: 'app'.concat('le') },  property
55         { str1: 'hello'.concat('world'), str2: 'ohelloworld'.substring(1) },  property
56         { str1: 'hello'.concat('world'), str2: 'ohelloworld'.substring(2) },  property
57         { str1: 'appleappleapple'.substring(5, 11), str2: 'app'.concat('le') },  property
59         { str1: 'apple', str2: 'appleappleapple'.substring(5, 10) },  property
60         { str1: 'appleappleapple'.substring(0, 5), str2: 'apple' },  property
62 …      { str1: 'hello'.concat('world').substring(2, 4), str2: 'hello'.substring(2, 3).concat('l') },  property
71         { str1: 'café', str2: 'cafe' },  property
72         { str1: 'café', str2: 'café' },  property
73         { str1: 'resumé', str2: 'resume' },  property
74         { str1: 'resume', str2: 'resumé' },  property
75         { str1: ' naïve', str2: 'naïve' },  property
76         { str1: 'naïve', str2: ' naïve' },  property
77         { str1: 'élan', str2: 'elan' },  property
78         { str1: 'élan', str2: 'e' + String.fromCharCode(0x0301) + 'lan' }  property