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(Letters correspond to those accompanying directive blocks.)
.SPACE and .SUBSPA specify the proper space and subspace for the
instructions that follow.
This four-directive sequence appears at the beginning of every
procedure. The directives are summarized in Appendix B.
The directives .EXIT and .PROCEND appear at the end of every
procedure. Their functions are summarized in Appendix B.
The .EXPORT list, which is the list of all procedures contained
within this process that can be globally accessed.
The .IMPORT list, which is the list of all procedures that this
process is dependent upon (includes the system initialization and
process termination procedures mentioned in the main program
code).
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