
$$      0 + {1\over \displaystyle  1 + {\strut 
             1\over\displaystyle   1 + {\strut
             1\over\displaystyle   3 + {\strut
             1\over\displaystyle  12 + {\strut
             1\over\displaystyle   1 + {\strut
             1\over\displaystyle   3
           }}}}}}$$
