1) G : to apprehend , to find out , to learn , to fathom , to know , to know sexually ;
2) Gtn : : to familiarize oneself , to study , to take cognizance of ;
3) D : to instruct , to teach , to explain , to make clear , to clrify , to enlighten (?) ;
4) Š : to inform , to brief , to report , to keep in the loop ;