LOOP AS $variable_name FROM start_expression | options_list
                     [TO end_expression]
                     [INCREMENT increment_expression] [ROW_COUNT $variable_name]

There are three types of option / counter loop:

  1. Literal Options List

LOOP AS $variable_name FROM "option 1, option 2, option 3" [ROW_COUNT $variable_name]
END_LOOP

  1. Options List from Variable

LOOP AS $variable_name FROM $options_variable_name [ROW_COUNT $variable_name]
END_LOOP

  1. Counter Loop

LOOP AS $variable_name FROM start_expression TO end_expression
            [INCREMENT increment_expression] 
            [ROW_COUNT $variable_name]
END_LOOP

Examples:

LOOP AS $iLoopCounter FROM 1 TO 10 ROW_COUNT $iLoopCount
    (commands go inside LOOP)
END_LOOP


LOOP AS $iLoopCounter FROM "Option 1,Option 2,Option 3" ROW_COUNT $iLoopCount
    (commands go inside LOOP)
END_LOOP


$aryStrOptions = "Option 1,Option 2,Option 3"
LOOP AS $iLoopCounter FROM $aryStrOptions ROW_COUNT $iLoopCount
    (commands go inside LOOP)
END_LOOP