Has anyone completed this trail? I am stomped on challenge number 3, regarding created the process for fulfillment. Any pointers or guidance would be appreciated.
 

Hi folks,
       can anyone tell me soql for getting user id who has access the record??
Like 
I have created test objects
5 users in my org.
if user 1 creates record on test object then user2,user3,user5 access that reocrd and user4 cannot access the reocrd
I wanna soql query for get all user id who has permission to access the record that is created by user1

Thanks in advance
Karthick