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  1. program Hello;
  2. var a, b:integer;
  3. begin
  4. a:=4; b:=6;
  5. repeat b:=a-b;
  6. writeln('a = ',a,' b = ',b);
  7. until a<b;
  8. end.
Success #stdin #stdout 0s 5268KB
stdin
Standard input is empty
stdout
a = 4 b = -2
a = 4 b = 6