• introduction
• step 1
• step 2
• step 3
• step 4
• step 5
• step 6
• step 7
• step 8
• step 9
  
• step 10
• step 11
• step 12
• step 13
• step 14
• step 15
• step 16
• step 17
• step 18
• step 19
• step 20

Note the position of the thread. The newly cut edge will be placed on top at this point.