function checkRows : boolean;
begin
  for i:=1 to 81 do
  begin
    if (length(ansArray[i]) = 1) then   //if the string length is 1, the answer is decided. need to remove the number from the row
    begin
      row := (((i-1)/9)+1);             //determines the row
      for v:=1 to 81 do
      begin
        if (row = (((v-1)/9)+1)) then   //checks if the row of boxes 1-81 matches the row of the string above ^
        begin
          if not (v = i) then           //if the box is not the same box as the correct string ^
          begin
            if not ((pos(ansArray[i], ansArray[v])) = 0) then     //if the string can be found in any of the strings on the same row
            begin
              //writeln(ansArray[i]+' is at box '+inttostr(i)+' and removed from box '+inttostr(v)+' because they are at the same row');
              delete(ansArray[v], (pos(ansArray[i], ansArray[v])), 1);          //finds and removes said string from the other string
              result := true;
            end;
          end;
        end;
      end;
    end;
  end;
end;