Fix expression to phrase

content/challenges/87.md

@@ -1,6 +1,6 @@
 ---
 japanese:
-  - - - pos: expression
+  - - - pos: phrase
         text: さぁさ
         dictionary: さあさあ
       - pos: noun
@@ -118,4 +118,4 @@ This week's challenge is from the lyrics of マイヒメ ([YouTube](https://www.
 
 {{< youtube TaK-Rdprtnw >}}
 
-*This challenge was suggested by **猛火妹紅（MochaMoko）** using the `-h suggest` command.*
+*This challenge was suggested by **猛火妹紅（MochaMoko）** using the `-h suggest` command.*