re:Need help to configure aptitude

[users@linuxforums.org]

cat /etc/apt/preferences
Package: *
Pin: release a=testing
Pin-Priority: 900

Package: *
Pin: release a=unstable
Pin-Priority: 800

Package: *
Pin: release a=stable
Pin-Priority: 700
[code:1:bdf5de3a17]apt-cache policy w3m[/code:1:bdf5de3a17]
w3m:
  Installed: (none)
  Candidate: 0.5-6
  Version Table:
     0.5-7 0
        800 ftp://www.lugs.org.sg unstable/main Packages
     0.5-6 0
        900 ftp://ftp.us.debian.org testing/main Packages
        900 [url]ftp://mirrors.kernel.org[/url] testing/main Packages

After changing sarge, sid and woody in /etc/apt/preferences to
testing, unstable and stable respectively, the priority seems to be
correct. However, when I do[code:1:bdf5de3a17]aptitude show ~Astable
~nw3m[/code:1:bdf5de3a17]or any  ~n<any packagename>, package
details of all available debian packages will scroll off the screen
for a few mins.

Is my syntax wrong?

Thanks !
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