| http://www.w3.org/ns/prov#value | - Furthermore, clock 13 or 23 could also be mechanical and/or electro-mechanical.Clock 13 or 23 may reset itself to zero after a certain length of time, e.g. every day, every week, every month, or every year.Clock 13 or 23 may be adjusted to match natural rhythms, such as for example the menstrual cycle so as to adapt the hair or skin treatment preparations as a function of position within the menst
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