1.5.1.8.3 Relative Subscripting
In relative subscripting, the name of a table element is followed by a subscript of the form data-name or index-name followed by the operator + or -, and an unsigned integer literal.
X As an IBM extension, the integer can be positively signed.
The operators + and - must be preceded and followed by a space. The value of the subscript used is the same as if the index-name or data-name had been set up or down by the value of the integer. The use of relative indexing does not cause the program to alter the value of the index.
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