--- /dev/null
+\version "2.12.3"
+
+\header {
+ texidoc = "When two (or more) accidentals modify the same pitch,
+they are printed adjacent to one another unless they represent the same
+alteration, in which case they are printed in exactly the same position
+as one another. In either case, collisions with accidentals of different
+pitches are correctly computed."
+}
+
+\relative c''
+{<< <dis aeses as a! a! ais aisis a,! aeh cis'> \\ <ais aih> >> }
+
+\paper {ragged-right = ##t}