Read the help file. It shows:
/PREP7! The .CBDO file must be read in PREP7
/INPUT,,cbdo ! Reads Jobname.cbdo up to the /EOF command
/INPUT,,cbdo,,:cb1 ! Reads same file from the label :cb1
It is read twice because there is an end of file (/eof) command in the cbdo file, which you must then bypass by reading in a second time (after the given label :cb1 -- see above).
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