user: Question: What is the an-stem for the word which has an ö-stems of siangar and an u-stem ending of syni?
Columns: ['Masculine a-stems', 'Masculine u-stems', 'Feminine ō-stems', 'Neuter a-stems', 'Masculine an-stems', 'Feminine ōn-stems']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['fisker', 'sun', 'siang', 'skip', 'biti', 'vika']
SQL:

assistant: SELECT "Masculine an-stems" FROM "Table" WHERE "Feminine ō-stems" = 'siangar' AND "Masculine u-stems" = 'syni';