上期IV版：

Day 1 1-4 DACB Day 2 1-4 CBBD

Day 3 1-4 CDAD Day 4 1-4 BDCC

Day 5 1-5 BACDD  6-10 ABCDB  11-15 CADBA

本期II版：

III. The letters meant a lot to Brian and kept him connected to a world he felt increasingly disconnected from.