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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

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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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