b d
for a^b_{c^d} (LaTeX) I tried "a^b!?c^d!!", but I get  a     .
                                                        c
                                                        b c
For a^{b^c}   (LaTeX) I tried "a^b^c!!",    but I get  a    .
Is it possible to sub/superscribe recursively? How?
Best regards,
Ludger Janauschek