The IGNORE LIST command may be used if you want the program to ignore any nonexistent member(s) that may be included in a member list specification. For example, for the sake of simplicity, a list of members may be specified as MEMB 3 TO 40 where members 10 and 11 do not exist. An error message can be avoided in this situation by providing the IGNORE LIST command anywhere in the beginning of input. A warning message, however, will appear for each nonexistent member.