$result_spl1 = [
                'str1',
                'str3',
                'str5',
                'str7',
                'str9',
               'str10'
               ];

$result_spl2 = [
                'str1',
                'str2',
                'str3',
                'str4',
               ];

$result_spl3 = [
                'str1',
                'str3',
                'str4',
               ];