ediff-combination-pattern

ediff-combination-pattern is a variable defined in `ediff-merg.el'.
Its value is

("<<<<<<< variant A" A ">>>>>>> variant B" B "####### Ancestor" Ancestor "======= end")

Documentation:
Pattern to be used for combining difference regions in buffers A and B.
The value must be a list of the form
(STRING1 bufspec1 STRING2 bufspec2 STRING3 bufspec3 STRING4)
where bufspec is the symbol A, B, or Ancestor. For instance, if the value is
'(STRING1 A STRING2 Ancestor STRING3 B STRING4) then the
combined text will look like this:

STRING1
diff region from variant A
STRING2
diff region from the ancestor
STRING3
diff region from variant B
STRING4


You can customize this variable.