Qatar and Oman are members of the Gulf Cooperation Council, GCC, which also groups Saudi Arabia, Kuwait, Bahrain and the United Arab Emirates (UAE).
There are at least 4 other countries other than Qatar and Oman that are members of the Gulf Cooperation Council
( z1 country :mod ( z2 other ) :ARG2-of ( z3 except :ARG1 ( z4 and :op ( z5 country :name ( z6 name :op "Qatar" ) ) :op ( z7 country :name ( z8 name :op "Oman" ) ) ) ) :quant ( z9 at-least :op 4 ) :ARG0-of ( z10 have-org-role :ARG1 ( z11 organization :name ( z12 name :op "Gulf" :op "Cooperation" :op "Council" ) ) :ARG2 ( z13 member ) ) )