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

Calculating dependencies ... done!
Dependency resolution took 0.96 s (backtrack: 0/20).

[ebuild  N     ] sci-libs/symmetrica-3.1.0:0/3::gentoo  USE="-doc" 748 KiB

Total: 1 package (1 new), Size of downloads: 748 KiB