import random

infile = open ('source.txt', 'r' )

wholetext=[]
for line in infile:
    wholetext.extend(line.split())
infile.close()

lookup={}
for i in range(0,len(wholetext)-2):
    key = (wholetext[i],wholetext[i+1])
    if not key in lookup.keys():
       lookup[key]=[]
    lookup[key].append(wholetext[i+2])
    if i % 1000 == 0:
       print str(i) + ' of ' + str(len(wholetext)) + ' done'

outfile = open('output','w')

w1=wholetext[0]
w2=wholetext[1]
outfile.write(w1 + ' ' + w2 + ' ')
while 1:
      key=(w1,w2)
      poss = lookup[key]
      x = random.randint(0,len(poss)-1)
      w3 = poss[x]
      outfile.write(w3 + ' ')
      w1=w2
      w2=w3

outfile.close()