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TurboPascal , - "" . , " ", , , . Debug .
Add.
(Add watch) , B=0, .
() , , Ctrl+F7. , , Enter ( [ OK ]).
, , Window Tile ( "") .
, , F6, . " "-" ¯ " Delete. , , Insert .
Step over Run , F8, , . , , .
"" , , , , Trace into Run , F7.