Final answer:
The code that identifies the order in which items within interchangeability and substitution (I&S) grouping are substituted or issued is usually provided in a suggested format, such as 2-71; 3-70; 4-69; 9; 12-23; 13-22.
Step-by-step explanation:
In interchangeability and substitution (I&S) grouping, the code that identifies the order in which items are substituted or issued is usually given in a suggested format. For example, in the given list of suggested codes: 2-71; 3-70; 4-69; 9; 12-23; 13-22, the items in the grouping would be substituted in the order of these codes.
The first item would be substituted with item 2, the second item with item 71, the third item with item 3, and so on. This code provides a guide on the sequence of substitution or issuance within the grouping.