Step 2: Remove characters
Be careful using the tools. Don't use cutter or you will risk your fingers.
Step 3: Stick on Number labels
Step 4: Glue into strips
The keys are arranged on same strips since the 7th, 14th, 21st and 28th must be the same day of week in the same month. So as to the others. For keys with 29, 30 and 31 stand alone. So when the job is done, there should have 7 strips with 4 keys and 3 separated keys.