tokens: ['The', 'following', 'subclauses', 'summarise', 'the', 'tasks', 'of', 'the', 'functions', 'comprising', 'the', 'OCS', 'Details', 'of', 'the', 'OCS', 'and', 'the', 'role', 'of', 'each', 'of', 'its', 'functional', 'components', 'are', 'described', 'in', 'TS', '', 'Telecommunication', 'management', 'Charging', 'management', 'Online', 'Charging', 'System', 'OCS', 'Applications', 'and', 'interfaces', '', '']