īr
The modifier Ä«r refers to the back of something. This is the same root as sÄ«ra. So, rÄ NP Ä«r is to the back of NP or to behind NP and rÅ« NP Ä«r is from the back of NP or from behind NP.
rÄjÄ«r
rÄjÄ«r is rÄ NP Ä«r without a specified location, and so means ‘to the back’.
rūjīr
Likewise rÅ«jÄ«r is rÅ« NP Ä«r without a specified location, and so means ‘from the back’ or ‘from behind’.