Hello, I've noticed two typos in the manual (the second one could be misleading). - p. 21, last sentence of sub-section 7.1, "It conventional to use [...]": a "is" is missing. - p. 63, second sentence of the penultimate paragraph, "[...] in place of a step b upto c.": "upto" should be replaced with "until". Regards, Laurent Méhats