https://books.google.co.uk/books?id=CAWtAAAAMAAJ&pg=PA258&lpg=PA258&dq=what+does+2M19+mean&source=bl&ots=mdUWoy7j44&sig=p6SP1q1dNUBa6d6aALGihZQPJw8&hl=en&sa=X&ved=0ahUKEwjVwuyY5c7NAhUJJsAKHZ6RByAQ6AEINzAG#v=onepage&q=what%20does%202M19%20mean&f=false
getting back to the centre...by using as many connections as you like, basically...go figure:
Wednesday, 29 June 2016
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