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A concatenation definition command takes the form:

DC cvar [(substring)] = x1 //x2 ...,

This defines cvar as a concatenation of items. These items may be cvars (with substrings), fields, or literals. The length of the cvar is the total number of characters in the concatenated string; the maximum length allowed is 128.

A destination substring may only be specified on the second or subsequent definition.

Examples of concatenation definition commands:

dc $part1=$part2//$part3,

dc $bit=$call(4:8)//$call(13:14),

dc $some(8:12)=$other(3:7)//$102-102//'A1',