some letter rambler examples

def create_ngram_letter_pairs(s):
  return [["".join(s[i:i+3]),"".join(s[i+3:i+5])] for i in range(len(s) - 4)]

# learn ngram letter pairs:
def learn_ngram_letter_pairs(context,filename):
  with open(filename,'r') as f:
    text = f.read()
    clean_text = re.sub('[<|>=\r\n]',' ',text)
    for ngram_pairs in create_ngram_letter_pairs(list(clean_text)):
      try:
        head,tail = ngram_pairs
        context.add_learn("next-2-letters",head,tail)
      except:
        continue
    
learn_ngram_letter_pairs(C,filename)

dest = "sw-examples/ngram-letter-pairs--sherlock-holmes.sw"
save_sw(C,dest)

next-2-letters |e R> => |ed> + |oa> + |ep> + |oy> + |eg> + |oc> + |uc>
next-2-letters | Re> => |d-> + |ti> + |ge> + |st> + |ad> + |pu> + |me> + |ce> + |di> + |pl> + |fu> + |ve>
next-2-letters |Red> => |-h> + |is>
next-2-letters |ed-> => |he> + |su> + |-e> + |in> + |-i> + |gi> + |-h> + |-w> + |lo> + |ta> + |ye> + |-s> + |co> + |up> + |-t>
next-2-letters |d-h> => |ea> + |um>
next-2-letters |-he> => |ad> + |re> + |ar> + | w> + | s> + | j> + |r > + | g>
next-2-letters |hea> => |de> + |rd> + |d > + |r > + |vy> + |d,> + |d.> + |rt> + |ds> + |vi> + |d;> + |d?> + |p.> + |ri> + |di> + |lt> + |r!> + |rs> + |ti> + |ve> + |p > + |l > + |da> + |te> + |dg> + |th> + |sa> + |pe> + |r:>
next-2-letters |ead> => |ed> + |er> + | s> + |fu> + | u> + | i> + | o> + |, > + |y > + |. > + |s > + |,"> + | t> + | w> + | a> + |; > + |?"> + |y,> + | f> + |y.> + |."> + |y-> + |in> + |en> + | b> + | h> + |ly> + |ow> + | m> + |li> + |il> + | D> + |ne> + | c> + | H> + |--> + | r> + | l> + |th> + |ac> + |ge> + |st> + | n> + | p> + | g> + |s?> + |ab>

# extract-3-tail-chars |abcdefgh> == |fgh>
# example usage:
# letter-ramble |*> #=> merge-labels(|_self> + pick-elt next-2-letters extract-3-tail-chars |_self>)
#
# assumes one is a ket
def extract_3_tail_chars(one):
  chars = one.label[-3:]
  return ket(chars)

sa: load ngram-letter-pairs--sherlock-holmes.sw
sa: letter-ramble |*> #=> merge-labels(|_self> + pick-elt next-2-letters extract-3-tail-chars |_self>)
sa: letter-ramble^1000 |The>
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sa: letter-ramble^1000 |Here>
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sa: letter-ramble^1000 |Here>
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next-2-letters |e R> => 133|ed> + 97|oa> + 66|ep> + 13|oy> + 4|eg> + 3|oc> + |uc>