SQL query

I have a query as follows -

select 

o.oname, i.table_name, i.column_name

from 

 dba_tab_columns i 

 join oar_table o on i.table_name = o.oname

where i.owner = 'ABCD'

and i.column_name like '%_CD'

group by o.oname;

I'm trying to return distinct values for the first column (oname) but as you can see, there are 3 duplicate values for ONAME.

ONAME             TABLE_NAME           COLUMN_NAME

------------------------------ ------------------------------ ------------------------------

CONTACT_SUMMARY      CONTACT_SUMMARY     LOCATION_TYPE_CD

REG_SUMMARY        REG_SUMMARY        DEST_COUNTRY_CD

REG_SUMMARY        REG_SUMMARY        CITIZENSHIP_CD

WAIVER_SUMMARY      WAIVER_SUMMARY      PA_WAIVER_CD