The UNSPEC pseudovariable assigns a bit value directly to x; that is, without conversion. The bit value is padded, if necessary, on the right with '0'B to match the length of x, according to Table 63.
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If x is a varying length string, its 2-byte prefix is included in the field to which the bit value is assigned. If x is an area, its control information is included in the receiving field.
The pseudovariable is subject to the rules for the UNSPEC built-in function described in UNSPEC.