Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_204_628 ( id number, "trial number" text, "date" text, "name of trial" text, "celebrity/ies taking part" text, "winner/number of stars" text, "notes" text )

### Question ###
jan and scott took part in trial number 10 . who took part in the previous trial ?

### Accurate SQL ###

SELECT "celebrity/ies taking part" FROM table_204_628 WHERE "trial number" = 10 - 1