human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Masculine a-stems, Masculine u-stems, Feminine ō-stems, Neuter a-stems, Masculine an-stems, Feminine ōn-stems
###Question: What is the u form of the word with a neuter form of skip and a masculine a-ending of fisker?
gpt
SELECT Masculine u-stems FROM table WHERE Neuter a-stems = skip AND Masculine a-stems = fisker