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5.1.6.3 Special Level-Numbers
Special level-numbers identify items that do not structure a record. The special level-numbers are:
66
Identifies items that must contain a RENAMES clause; such items regroup previously defined data items.
(For details, see "RENAMES Clause" in topic 5.3.13.)
77
Identifies data item description entries -- independent Working-Storage or Linkage Section items that are not subdivisions of other items, and are not subdivided themselves. Level-77 items must begin in Area A.
88
Identifies any condition-name entry that is associated with a particular value of a conditional variable. (For details, see "VALUE Clause" in topic 5.3.17.)
Note: Level-77 and level-01 entries in the Working-Storage and Linkage Sections that are referenced in the program must be given unique data-names, because neither can be qualified. Subordinate data-names that are referenced in the program must be either uniquely defined, or made unique through qualification. Unreferenced data-names need not be uniquely defined.

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