Quick question about my new hypertrophy routine

[Junkboxer]

Three-Day Hypertrophy Workout

Day 1 ? Pull
A) Chin ups, 4 x 8-12
B1) Wide grip lat pull down, 3 x 8-15
B2) Shoulders shrugs, 3 x 8-15
C) Single arm bent over row ,3 x 8-12
D) Hammer strength high-low row, 3 x 8-12
E1) Rear deltoid flyes, 3 x 10-15
E2) Biceps curls, 3 x 10-15

Day 2 ? Legs/Hips
A) Back squat, 4 x 10-15
B) Front squat, 3 x 8-12
C) Reverse lunge (same side), 3 x 10-12
D1) Hamstring curls, 3 x 8-12
D2) Leg extension, 3 x 8-12
E1) Hip thrust, 3 x 12-15
E2) Calf raise, 3 x 12-15

Day 3 ? Push
A) DB bench press or free motion chest, 4 x 8-12
B) Hammer strength incline press, 3 x 8-12
C) DB overhead press, 4 x 8-12
D) Close-grip push up (hands on med ball), 3 x 12-15
E1) Shoulder lateral raises, 3 x 12-15

E2) Triceps extensions, 3 x 12-15

What does the "B1)" and "B2)" signify on day 1? or the "E1)" and "E2)" mean on the same day. all my workout days have these and i dont understand it? does it mean superset...like, rotate between each exercise every set? or is this routine giving me an option for picking one of the two choices?

 

[Junkboxer]

also im a TRT patient who blasts/cruises so no whether im blasting or cruising my T levels are always optimal so can i get away with doing this 3 day routine TWICE a week instead of just once?