\usepackage{xcolor}+
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\usepackage{fontspec}+
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\usepackage[sc]{mathpazo}+
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\usepackage{fontspec}+
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\setmainfont[Ligatures=TeX]{Palatino Linotype}+
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\usepackage{amssymb}+
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\usepackage{amsmath}+
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\usepackage{menukeys}+
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\definecolor{darkblue}{rgb}{0,0,0.6}+
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\usepackage[colorlinks=true,urlcolor=darkblue,linkcolor=darkblue]{hyperref}+
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+
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%%% for trees+
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%% http://anorien.csc.warwick.ac.uk/mirrors/CTAN/graphics/pgf/contrib/forest/forest.pdf+
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+
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\newcommand\grid[1]{%+
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\begin{tikzpicture}[baseline=(char.base)]+
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  \path[use as bounding box]+
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    (0,0) rectangle (1em,1em);+
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  \draw[red!50, fill=red!20]+
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    (0,0) rectangle (1em,1em);+
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  \node[inner sep=1pt,anchor=base west]+
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    (char) at (0em,\gridraiseamount) {#1};+
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\end{tikzpicture}}+
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\newcommand\gridraiseamount{0.12em}+
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+
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\makeatletter+
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\newcommand\Grid[1]{%+
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  \@tfor\z:=#1\do{\grid{\z}}}+
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\makeatother	+
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+
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\newcommand\Vspace[1][.3em]{%+
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  \mbox{\kern.06em\vrule height.3ex}%+
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  \vbox{\hrule width#1}%+
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  \hbox{\vrule height.3ex}}+
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+
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\def\VS{\Vspace[0.6em]}+
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+
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+
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\newcommand{\dn}{\stackrel{\mbox{\scriptsize def}}{=}}+
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\newcommand{\defn}[1]{\textit{\textbf{#1}}}+
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\newcommand{\dq}[1]{\mbox{\tt{"}}#1\mbox{\tt{"}}}+
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+
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\definecolor{codegray}{gray}{0.9}+
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+
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\makeatletter+
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\def\fnote{\gdef\@thefnmark{}\@footnotetext}+
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\makeatother+
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+
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\newcommand{\HEADER}{{\bf Please submit your solutions via email. Please submit +
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only ASCII text or PDFs. Every solution should be preceeded by the corresponding +
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question, like:+
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+
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\begin{center}+
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\begin{tabular}{ll}+
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Q$n$: & \ldots a difficult question from me\ldots\\+
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A:    & \ldots an answer from you \ldots\\+
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Q$n+1$ & \ldots another difficult question\ldots\\+
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A:     & \ldots another brilliant answer from you\ldots+
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\end{tabular}+
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\end{center}+
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+
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\noindent Solutions will only be accepted until 30th December! Please send only+
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one homework per email.}\bigskip}+
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