When whorls appear in both thumbs the sequence is:

I M O I M O I M O
- - - - - - - - -
I I I M M M O O O

When a whorl appears in the right thumb and a loop in the left, the sequence is:

I M O I M O I M O
- - - - - - - - -
S S S M M M L L L

When a loop appears in the right thumb and a whorl in the left, the sequence is:

S M L S M L S M L
- - - - - - - - -
I I I M M M O O O

V. Second Subsecondary:

SSStoLLL.
SSSLLL

The sequence for filing the second subsecondary is as follows: