I have a question in split partition. The table name is sales_by_region.

CREATE TABLE sales_by_region (item# INTEGER, qty INTEGER,
store_name VARCHAR(30), state_code VARCHAR(2),
sale_date DATE)
STORAGE(INITIAL 10K NEXT 20K) TABLESPACE sap_stage_data
PARTITION BY LIST (state_code)
(
PARTITION region_east
VALUES ('MA','NY','CT','NH','ME','MD','VA','PA','NJ')
STORAGE (INITIAL 20K NEXT 40K PCTINCREASE 50)
TABLESPACE sap_stage_data,
PARTITION region_west
VALUES ('CA','AZ','NM','OR','WA','UT','NV','CO')
PCTFREE 25 NOLOGGING,
PARTITION region_south
VALUES ('TX','KY','TN','LA','MS','AR','AL','GA'),
PARTITION region_central
VALUES ('OH','ND','SD','MO','IL','MI','IA'),
PARTITION region_null
VALUES (NULL),
PARTITION region_unknown
VALUES (DEFAULT)
);

I am splitting the region_east partition into region_east_1 & region_east_2 as below. My question is, which values('CT', 'VA', 'MD') goes to region_east_1 and which values goes to region_east_2 partition. How oracle maps these values('CT', 'VA', 'MD') to two partitions(region_east_1 & region_east_2). Can any one please clarify?

ALTER TABLE sales_by_region
SPLIT PARTITION region_east VALUES ('CT', 'VA', 'MD')
INTO
( PARTITION region_east_1
PCTFREE 25 TABLESPACE sap_stage_data,
PARTITION region_east_2
STORAGE (NEXT 2M PCTINCREASE 25))
PARALLEL 5;