CREATE TABLE table_name_4 (pinyin VARCHAR2, wade_giles VARCHAR2)

What is the Pinyin translation of the Wade-Giles of hsin-y an-i-ma?
SELECT pinyin FROM table_name_4 WHERE wade_giles = "hsin-yüan-i-ma"
SELECT "pinyin" FROM "table_name_4" WHERE "hsin-yüan-i-ma" = "wade_giles"