f57v

[Sam G]

It's difficult to know the level of detail at which to analyze these sequences...

• The 11th character has a foot on the inner three rings, but not on the outer one.
  
• The foot of the Latin "9" abbreviation shape on the 10th character touches the base on the inner three, but not on the outer one.
  
• The curl on the 12th character doesn't touch the stem on the inner three, but it does on the outer one.
  
• The leg on the 16th character is curved on the inner three, but not on the outer one.
  
• The lower left part of the loop of the 3rd character is curved on the inner three, but not on the outer one.
  
• The right-hand stem of character 17 curves up on the inner three, but down on the outer one.
  
• The leg of character 14 has no foot on the inner three rings, but has a foot on the outer one.
  
• There is a foot on the 7th character in rings 2 and 4, but not 1 and 3.
  
• There is no loop on the end of the tail of character 8 in rings 2 and 4, but there is in rings 1 and 3.
  
• Character 6 has a straight right leg in rings 2 and 4, but a slight foot in rings 1 and 3.
  

Of these, I would say the variation in character 8 definitely looks deliberate, though I would say the tail is straight in 1 and 3 and hooked in 2 and 4. (Edit: I just realized that you are counting from bottom to top while I'm counting from top to bottom.)

Now, here's something interesting: character 8 alternates according to the pattern ABAB, but character 9 (the f/p) alternates AABB.  That means that just by looking at this pair of characters you can know which iteration of the sequence you are in (by whether the pair is AA, BA, AB, or BB).

Characters 3 and 16 both follow the pattern ABBB, and in both cases the A form has a straight left stroke (in j or I) and the B form has a curved left stroke (in d or c).  These characters both tell you whether you are in the first iteration of the sequence or not.

Still no idea what it may mean...