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uses
Math;
begin
if not(isnan(nan)) then
begin
writeln('error 1');
halt(1);
end;
if not(isinfinite(infinity)) then
begin
writeln('error 2');
halt(1);
end;
if isnan(12341234) then
begin
writeln('error 3');
halt(1);
end;
if isinfinite(0) then
begin
writeln('error 4');
halt(1);
end;
if isinfinite(12341234) then
begin
writeln('error 5');
halt(1);
end;
end.
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