How to make environments (tabular, multicols, etc.) hug the inner margin and not the left margin?

Question

I am currently reading LaTeX: A Document Preparation System, 2nd Edition by Leslie Lamport, and for learning purposes am trying to recreate certain structures present in the book.
For instance, in the book the author uses two-column sections to show the code (right column) and the output of the code (left column).
Below is a screenshot of an example:

The problem is that I can't recreate the same structure (I am using the multicol package for this, with the verbatim environment in the right column) while using the book document class, because on even-numbered pages the two-column section is hugging the left margin.
When the code in the right column is longer than half of textwidth, it gets printed inside the inner margin (example below, lines with black squares).

The same happens with tables (made with tabular) which are longer than textwidth (example below).

In all of these cases I would like to make these environments hug the inner margin (right margin for even-numbered pages and left margin for odd-numbered pages) and print the leftover part in the outer margins.
Of course, this should happen only when the width of the environment is bigger than textwidth.
EDIT: Added a minimal working example.
documentclass[12pt,a4paper]{book}

usepackage{blindtext}
usepackage{multicol}

begin{document}

blindtext

begin{multicols}{2}scriptsize
  noindent
  An intra-word dash or hyphen, as in X-ray.
  A medium dash (en-dash) for number ranges, like 1--2.
  A punctuation dash---like this (also know as em-dash).
  columnbreak
begin{verbatim}
An intra-word dash or hyphen, as in X-ray.
A medium dash (en-dash) for number ranges, like 1--2.
A punctuation dash---like this (also know as em-dash).
end{verbatim}
end{multicols}

blindtext

begin{center}
  setlength{tabcolsep}{1em}
  begin{tabular}{| l | l | l | l | l | l |}
    hline
    textit{cmd}   & textit{decl}   & textit{cmd}   & textit{decl}    & textit{cmd}   & textit{decl}    
    hline
    verb|textup| & verb|upshape| & verb|textsc| & verb|scshape|  & verb|textrm| & verb|rmfamily| 
    verb|textit| & verb|itshape| & verb|textmd| & verb|mdseries| & verb|textsf| & verb|sffamily| 
    verb|textsl| & verb|slshape| & verb|textbf| & verb|bfseries| & verb|texttt| & verb|ttfamily| 
    hline
  end{tabular}
end{center}

blindtext

begin{multicols}{2}scriptsize
  noindent
  An intra-word dash or hyphen, as in X-ray.
  A medium dash (en-dash) for number ranges, like 1--2.
  A punctuation dash---like this (also know as em-dash).
  columnbreak
begin{verbatim}
An intra-word dash or hyphen, as in X-ray.
A medium dash (en-dash) for number ranges, like 1--2.
A punctuation dash---like this (also know as em-dash).
end{verbatim}
end{multicols}

blindtext

begin{center}
  setlength{tabcolsep}{1em}
  begin{tabular}{| l | l | l | l | l | l |}
    hline
    textit{cmd}   & textit{decl}   & textit{cmd}   & textit{decl}    & textit{cmd}   & textit{decl}    
    hline
    verb|textup| & verb|upshape| & verb|textsc| & verb|scshape|  & verb|textrm| & verb|rmfamily| 
    verb|textit| & verb|itshape| & verb|textmd| & verb|mdseries| & verb|textsf| & verb|sffamily| 
    verb|textsl| & verb|slshape| & verb|textbf| & verb|bfseries| & verb|texttt| & verb|ttfamily| 
    hline
  end{tabular}
end{center}

blindtext

end{document}

John Kormylo · Answer

This uses paracol to reduce the column width rather than deliberately exceeding it elsewhere.  You will also note that this approach lines up with the headers the same as the example.
Interestingly, without the verbatim multicols ignored the columnbreak, but a simple paragraph break did the trick.
documentclass[12pt,a4paper]{book}
usepackage[textwidth=6in,showframe]{geometry}
usepackage{blindtext}
usepackage{multicol}
usepackage{paracol}
twosided
setcolumnwidth{0.9textwidth}

begin{document}