CREATE TABLE table_name_49 (masculine_an_stems VARCHAR(255), feminine_ō_stems VARCHAR(255), masculine_u_stems VARCHAR(255))
What is the masculine an form for the word with a feminine ö ending of siangar and a masculine u ending of sunar?
    
SQL: SELECT masculine_an_stems FROM table_name_49 WHERE feminine_ō_stems = "siangar" AND masculine_u_stems = "sunar"