These are the packages that would be merged, in order:

Calculating dependencies ...

!!! Problem resolving dependencies for =media-sound/lilypond-2.24.4-r100
 done!
Dependency resolution took 0.83 s (backtrack: 0/20).


!!! The ebuild selected to satisfy "=media-sound/lilypond-2.24.4-r100" has unmet requirements.
- media-sound/lilypond-2.24.4-r100::gentoo USE="-debug -doc -emacs -profile" GUILE_SINGLE_TARGET="3-0 -2-2" L10N="-ca -cs -de -en -fr -hu -it -ja -nl -pt -zh" PYTHON_SINGLE_TARGET="-python3_12 -python3_13"

  The following REQUIRED_USE flag constraints are unsatisfied:
    exactly-one-of ( python_single_target_python3_12 python_single_target_python3_13 )

  The above constraints are a subset of the following complete expression:
    exactly-one-of ( guile_single_target_2-2 guile_single_target_3-0 ) exactly-one-of ( python_single_target_python3_12 python_single_target_python3_13 )