13 Dec
2011
13 Dec
'11
10:33 a.m.
Six, one, eight, five, two, seven, four, ten, one, two, two, three, seven, zero, close.
Ask the kids to draw a thin vertical stroke after each letter "e". Count the letters between the strokes. Enjoy!
That's a solution of the Post correspondence problem over the words: xxe|e xxx|xe xxxee|xxe xxxx|xxxe xxxe|xxxxe xxx|xxxxxe xexex|xxxxxxe exxxx|xxxxxxxe xxxe|xxxxxxxxe xex|xxxxxxxxxe xexxxxxxe| As well as the restriction that the fnal word ('zero close') appears once at the end of the string. http://en.wikipedia.org/wiki/Post_correspondence_problem Sincerely, Adam P. Goucher