{"chapter":"Introduction","author":"Ernst Hemmingway","dep":"","indep":"","irrelevant_col":"abc"}
{"chapter":"Ambivalence","author":"Agatha Christie","dep":"matches('^c_'), a_1:a_6, a_9","indep":"x1_sex","irrelevant_col":"abc"}
{"chapter":"Big mysteries","author":"Mark Twain","dep":"p_1:p_4, b_1:b_3","indep":"x3_nationality","irrelevant_col":"abc"}
{"chapter":"Confidence","author":"Stephen King","dep":"starts_with('d_'), matches('^e_')","indep":"f_uni","irrelevant_col":"abc"}
{"chapter":"Doubt","dep":"open_comments","indep":"","irrelevant_col":"abc"}