Example using `gb4e` without gloss line

Example using `gb4e` without gloss line

Using gb4e I can leave off the free translation line of a three-line format, but is there a way to leave off the gloss line? I am using examples from linguists who gave only the source language and the free translation in their original publications.
In the MWE below, the example01 and example03 will compile, but not example02. Is there a way to have the source text and the free translation, without the gloss line?
I could simply have a numbered example, but for the sake of coding consistency with examples, I'd like to continue using \gll and \glt.
\documentclass{article}
\usepackage[margin=1in]{geometry}
\usepackage{gb4e}
\begin{document}
In example (\ref{citko21}) we can see some data from Polish.
   \begin{exe}
   \ex\label{citko21}
   \begin{xlist}
%example01(all three lines)
   \ex \gll One     Jan lubi e      a Maria podziwia e?\\
       who.ACC Jan likes e.ACC and Maria admires e.ACC\\
       \glt `Who does Jan like and Maria admire?'
%example02(lacks gloss line)
%compiling either fails at this point or this example is just skipped
  \ex \gll Two     Jan lubi e      a Maria podziwia e?\\
      \glt `Who does Jan like and Maria admire?'
%example03(lacks free translation line)
  \ex \gll Three     Jan lubi e      a Maria podziwia e?\\
           who.ACC Jan likes e.ACC and Maria admires e.ACC\\
\end{xlist}
\end{exe}
\end{document}