insertinstalledpackage 'pkgx' 'none' '1'
insertinstalledpackage 'pkgy' 'none' '1' 'Depends: pkgz, pkgx (>= 1)'
insertinstalledpackage 'pkgz' 'none' '1'
insertinstalledpackage 'pkgx' 'none' '1'
insertinstalledpackage 'pkgy' 'none' '1' 'Depends: pkgz, pkgx (>= 1)'
insertinstalledpackage 'pkgz' 'none' '1'