the right way to put one foot before the other

having read the electronic version of the book I was very frustrated not to have a paspier version, which is easier to browse when you want to recall a passage.
it's done and I advise everyone to book that has increasingly been revised and improved.
I'm about to crack.
it's simple efficient accurate, method and scientifically well explained, easy to implement. it only remains to make its baskettes !!!

yannick CLA..S