Unless you understand "Step 1" you'll not understand "Step 2". Concept #2, Step 1.
The following are under construction and may not be current
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AI: 1st command
PK: 2nd command
OI: 3rd command
IP: 4th command
OP: 5th command
SF: 6th command
IQ: 7th command
ID: 8th command
KE: 9th command