For several years in the early nineties the late Michael Downes presented
a series of TeX macro programming challenges he called Around the Bend. These
were archived on CTAN in info/aro-bend, but are now in info/challenges/aro-bend,
as 36 files called exercise.* and answer.*, but in general Around the Bend
is not well known even though it illuminates some of the essential, but
possibly more arcane, aspects of TeX.
I have been presumptuous and taken the liberty of putting them all into
a single document, AroundTheBend.pdf, which might be more accessible than
the individual postings that form the original archive. I have also included
three challenges, namely 19, 20, and 21, that have not made it into the
CTAN archive.
If Michael was still with us I imagine that he would have put no
restrictions on his work. With this in mind, the files comprising
AroundTheBend.tex, which is the basis for AroundTheBend.pdf, are under
the LPPL.
