feat: purge selected packages in one transaction

README.md

@@ -153,6 +153,8 @@ other command suffixes.
 | end of input | abort without upgrading (exit 2) |
 
 Several tokens may share a line (`1? 3- 4+`); they run left to right. Consecutive
+`Nx` commands such as `5x 30x 41x` are simulated and confirmed together. Another
+command ends the group; a dependent can be included with its dependency. Consecutive
 `N+` commands are processed together: selected packages required by another selected
 package are recorded as dependencies, regardless of their order. `*+` works the same
 way. With `--all`