Table: vuelta_1984
Columns: stage
winner
general_classification
points_classification
mountains_classification
team_classification

Question: Name the points classification for stage of 18b
SQL: SELECT "points_classification" FROM vuelta_1984 WHERE "stage" = '18b'

Question: Name the points classification of stage 16
SQL: SELECT "points_classification" FROM vuelta_1984 WHERE "stage" = '16'