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if (S1<>'') and (S2<>'') and (S3<>'') and (S4<>'') then
begin
//...
end else begin
//...
end;
if (s1 <>'') and (s2 <>'') and (s3 <>'') then
begin
end;
if () and () and () then
if () or () or () then
jf
if (Trim(S1) <>'') and (Trim(S2) <>'') and (Trim(S3) <>'') and (Trim(S4) <>'') then
begin
//...
end else begin
//...
end;
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if not Sametext(s1+s2+s3+s4, '') then begin
end;
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if s1+s2+s3+s4 <> '' then begin
end;
if (s1 = '') or (s2 = '') or (s3 = '') or (s4 = '') then
begin
end
eles
begin
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end;
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