export PRAXIS=/home/phil/praxis

awk ' # permuted table of contents (page "permuted")

BEGIN { FS = "\n"; RS = ""
        split("Jan:Feb:Mar:Apr:May:Jun:Jul:Aug:Sep:Oct:Nov:Dec",
              monthname, ":") }

$1 ~ /^number\t[1-9][0-9]*$/ {

    for (i in val) delete val[i]

    for (i=1; i<=NF; i++)
        if (split($i, f, /\t/) == 2)
            val[f[1]] = f[2]

    if (val["ptitle"] == "")
        val["ptitle"] = val["title"]

    if (val["pblurb"] == "")
        val["pblurb"] = val["blurb"]

    for (i in words) delete words[i]
    for (i in pwords) delete pwords[i]

    n = split(val["title"] ": " val["blurb"], words, / /)
    if (split(val["ptitle"] ": " val["pblurb"], pwords, / /) != n)
        print "error: unmatched word count at " val["number"] | "cat 1>&2"

    for (i=1; i<=n; i++) { # main loop to generate rotated permutations

        sortkey = suffix = ""
        for (j=i; j<=n; j++) {
            sortkey = sortkey " " pwords[j]
            suffix = suffix " " words[j] }
        sortkey = substr(sortkey,2); suffix = substr(suffix,2)

        prefix = ""
        for (j=1; j<i; j++)
            prefix = prefix " " words[j]
        prefix = substr(prefix,2)

        printf "%s\t<tr><td>%d</td><td>%02d %s %d</td>" \
               "<td align=\"right\">%s</td><td>%s</td>" \
               "<td><a href=\"/%d/%02d/%02d/%s/\">exercise</a> " \
               "<a href=\"/%d/%02d/%02d/%s/%d/\">solution</a> " \
               "<a href=\"http://programmingpraxis.codepad.org/" \
               "%s\">codepad</a></td></tr>\n",
               sortkey, val["number"], val["pubday"],
               monthname[val["pubmon"]], val["pubyear"],
               prefix ? prefix : "&nbsp;", suffix,
               val["pubyear"], val["pubmon"], val["pubday"],
               val["file"], val["pubyear"], val["pubmon"],
               val["pubday"], val["file"], val["soln"],
               val["codepad"] } }

' $PRAXIS/praxis.info |
awk '$0 !~ /^(a|an|and|as|at|but|by|for|from|his|in|it|my|of|on|or|our|per|that|the|to|which|with|A|An|And|As|At|But|By|For|From|His|In|In|My|Of|On|Or|Our|Per|That|The|To|Which|With) /' | sort -f | cut -f2 >$PRAXIS/pages/permuted

ed -s $PRAXIS/pages/permuted <<'EOF'
0a
<table cellpadding="10">
.
$a
</table>
.
w
q
EOF