�?�?t ε l ρ l v l + �?�?ε l ρ l v l v l = ε l �?�?τ l + ε l ρ l g �?ε l �?p �?β v l �?v s All promises expressed in the following paragraphs are entirely All those of the authors and do not automatically stand for those of their affiliated corporations, or Those people from the publisher, the editors plus the re