Given the task definition and input, reply with output. In this task, you are given a question and a context passage. You have to answer the question based on the given passage.

What type of system was discontinued in Finland's school system?, Context: Finland has used comprehensive schools since the 1970s, in the sense that everyone is expected to complete the nine grades of peruskoulu, from the age 7 to 16. The division to lower comprehensive school (grades 1–6, ala-aste, alakoulu) and upper comprehensive school (grades 7–9, yläaste, yläkoulu) has been discontinued.
peruskoulu