mo.py

variant = [[1,2,4,5,6],[7,8,10,11,12],[13,14,16,17,18],[19,20,22,23,24],[25,26,28,29,30]]

for a in variant:
 row = a
 next = row[1]
 for i in row:
  if next-i == 1:
   if next == row[1]:
    next = row[2]
   elif next == row[2]:
    next = row[3]
   elif next == row[3]:
    next = row[4]   
  elif next == i:
   break
  else:
   print i+1
   if next == row[2]:
    next = row[3]
   elif next == row[3]:
    next = row[4]