Log_file_name_convert syntax in case of mutilple redo members

Dear Oracle's guru,
I am making script for rman duplication.
on Target db I have 3 redo groups Each have 2 members on diff directory path.On aux(different machine) log files under /u01 will move to /ora1
and /u02 will move to /ora2
/u01/oradata/prod/redo01.log
/u02/oradata/prod/redo01b.log
/u01/oradata/prod/redo02.log
/u02/oradata/prod/redo02b.log
/u01/oradata/prod/redo03.log
/u02/oradata/prod/redo03b.log
I know
DB_FILE_NAME_CONVERT='/u01/oradata/prod/', '/ora1/oradata/aux/'
what should be the right syntax for log_file_name_convert
I search oracle site but it just listed case 1 example
log_file_name_convert=(<source_db_path>,<target_db_path>)
should I be using
log_file_name_convert='/u01/oradata/prod/','/ora1/oradata/aux/','/u02/oradata/prod/','/ora2/oradata/aux/'
Thanks for your time..

Thanks everybody for your reply and time .
I have already seen those links.
little bit confused(or totally confused)
I am not creating standby database.
I am just duplicating prod to test.
target ->aux
u01/oradata/prod/redo01.log ->/ora1/oradata/test/redo01.log
/u02/oradata/prod/redo01b.log->/ora2/oradata/test/redo0b.log
/u01/oradata/prod/redo02.log->/ora1/oradata/test/redo02.log
/u02/oradata/prod/redo02b.log-/ora2/oradata/test/redo02b.log
/u01/oradata/prod/redo03.log->/ora1/oradata/test/redo03.log
/u02/oradata/prod/redo03b.log->/ora2/oradata/test/redo03b.log
log_file_name_convert='/u01/oradata/prod/','/ora1/oradata/test/','/u02/oradata/prod/','/ora2/oradata/test/'
Run
ALLOCATE AUXILIARY CHANNEL aux1 DEVICE TYPE DISK;
ALLOCATE AUXILIARY CHANNEL aux2 DEVICE TYPE DISK;
ALLOCATE AUXILIARY CHANNEL aux3 DEVICE TYPE DISK;
#SET UNTIL SEQUENCE 10008 thread 1;
SET UNTIL TIME "TO_DATE('17-Aug-2011 15:11:01', 'dd-mon-YYYY hh24:mi:ss')";
DUPLICATE TARGET DATABASE TO "test"
PFILE=/opt/oracle/product/10.2/db_1/dbs/inittest.ora
DB_FILE_NAME_CONVERT='/u01/oradata/prod/', '/ora1/oradata/test/'
log_file_name_convert='/u01/oradata/prod/','/ora1/oradata/test/','/u02/oradata/prod/','/ora2/oradata/test/'
1)is log_file_covert allowed inside run block?
2)is log_file_name_convert syntax right for mutiple coversion pair?
how Oracle duplicate command determine 1('/u01/oradata/prod/) and 4 ('/u01/oradata/prod/) belongs to target
and 3 '/ora1/oradata/test and 4 ora2/oradata/test/ belongs to aux.
Does even postion belong to target
and odd position belongs to auxillary
will rman create 3 groups on aux and 2 members on aux?
3) Do I have to use nofilenamecheck since I am not renaming file ,but directory path is diifrent

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