It repeats this throughout. Enjoy.
[ Tab from: https://www.guitartabs.cc/tabs/r/rihanna/rehab_tab.html ]
eb|---------------------------------------------------------------------------|
Bb|--------0---1----------1h3h1-------------0----------------1----------------|
Gb|------2--------2-----0-------0---0-----------2--0-------2---2--------------|
Db|----2--------------2-----------2-------0--------------3-------3------------|
Ab|--0--------------3-------------------2--------------3-----------3----------|
Eb|-----------------------------------3--------------1------------------------|