#! /bin/sh

sigsize=$1; shift
printf "$sigsize:"

comma=
for page in $(seq 0 2 $(expr $(expr $sigsize - 1 ) / 2)); do
    face=$(expr $sigsize - $page - 1)
    printf "%s%d(1w,0h)L+%d(1w,.5h)L," "$comma" $face $page
    opage=$(expr $page + 1)
    oface=$(expr $face - 1)
    printf "%d(1w,0h)L+%d(1w,.5h)L" $opage $oface
    comma=,
done

printf "\n"