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def xkcdify(borders=True, code=True, html=True, prompts=True, output=True,
    font_url='https://github.com/ipython/xkcd-font/raw/master/build/xkcd.otf'):
    """Turn on xkcd mode for the notebook.
    
    Run this in your notebook and it will enable the xkcd regular font
    from the xkcd website. This font is downloaded from the internet
    so this only works if you are online.

    This mode can be used with Matplotlib's new xkcd mode to great effect. However,
    you will have to enable that separately by calling matplotlibs xkcd function.

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// Simple IPython Notebook test
// Requires PhantomJS and CasperJS.
// To run:
// 1) Start a notebook server in an empty directory.
// 2) casperjs test_basic.js

var casper = require('casper').create({
    // verbose: true,
    // logLevel: "debug"
});

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    OutputArea.prototype.append_svg = function (svg, element) {
        var toinsert = $("<div/>").addClass("box-flex1 output_subarea output_svg");
        toinsert.append(svg);
        element.append(toinsert);
        // The <svg> tag cannot be made resizable so we wrap it in a resizable <div>.
        // The problem with this is that we need to 1) set the initial size of the
        // <div> based on the size of the <svg> and 2) we need to tie the size of the
        // <div> and the <svg>.
        var img = $('<div/>');
        img.html(svg);

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import networkx as nx
import matplotlib as mat

# Builds a graphene sheet with the given number of rows and columns.
# The sheet has a defected column running through the optionally passed
# arg. Otherwise it defaults to the center.
def build_defected_graph(rows, columns, defect = 0):
    g = nx.Graph()
    
    if( columns <= 2 ):