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

Calculating dependencies ... done!
Dependency resolution took 0.97 s (backtrack: 0/20).

[ebuild  N     ] sci-mathematics/planarity-5.0.0.0-r2:0/4::gentoo  595 KiB

Total: 1 package (1 new), Size of downloads: 595 KiB