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     Directive     Description
 
     STRUCT        Defines data structure
     UNION         Defines overlapping data structure
     RECORD        Defines data record
     TYPEDEF       Defines data type
     ENDS          Ends data structure definition
 
     MASK          Returns bit mask of occupied bits in field
     WIDTH         Returns width of record or record field
     SIZEOF        Bytes allocated for variable
     LENGTHOF      Number of data items in structure
 
     ALIGN         Aligns code or data to given boundary
     EVEN          Aligns code or data to even (word) boundary
     ORG           Sets location counter
 
     See also: Structure-field Reference operator (.)
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