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How to view diff when doing `git push --force`




Hi. I have done `git push --force` but I forget to `pull`, 


Counting objects: 7, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (7/7), done.
Writing objects: 100% (7/7), 765 bytes | 0 bytes/s, done.
Total 7 (delta 6), reused 0 (delta 0)
To xxxgit:cry/cry.git
 + 48e9058...117ee39 staging -> staging (forced update)

But I can not view diff:

git show 48e9058...117ee39
fatal: ambiguous argument '48e9058...117ee39': unknown revision or path not in the working tree.
Use '--' to separate paths from revisions, like this:
'git <command> [<revision>...] -- [<file>...]'


May I pull info about changes that was deleted?