List grantee right in oracle

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create user xx identified by password;

grant create session to xx;
grant select on USER to xx;
grant select on PAYMENT to xx;
grant select on COMPANY to xx;

select * from user_tab_privs where grantee = 'xx'

select * from sys.all_tables;
select * from sys.all_synonyms;
select * from sys.all_views;