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

Calculating dependencies ... done!
Dependency resolution took 1.01 s (backtrack: 0/20).

[ebuild  N     ] sci-mathematics/spin-6.5.2-r1::gentoo  USE="-doc -examples -graphviz -tk" 5943 KiB

Total: 1 package (1 new), Size of downloads: 5943 KiB