5 Folded. This doesn't make sense without alternatives, but it works.
10 \context Staff
\notes \relative c'' {
11 \repeat fold
3 { c^"3$\\times$ 0alt" d }
13 \repeat fold
4 { c^"4$\\times$ 2alt" d } \alternative { e f }
15 \repeat fold
2 { c^"2$\\times$ 3alt" d } \alternative { e f g }