LPC RPC LC RC???

I've just ran across these abreviations and am figuring them out. I did find this explanation given for a specific pattern. I'm still investigating.

1/1 RPC = 1 st crossing over 1 st to the right, with the st underneath purled
1/1 LPC = 1 st crossing over 1 st to the left, with the st underneath purled

These cables are each worked using 3 sts:
2/1 RPC = 2 sts crossing over 1 st to the right, with the st underneath purled
2/1 LPC = 2 sts crossing over 1 st to the left, with the st underneath purled
2/1 RC = 2 sts crossing over 1 st to the right, all sts knit
2/1 LC = 2 sts crossing over 1 st to the left, all sts knit

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Then I found this: The Definition for "2/1 RPC" given in the back in the book is incorrect; it should read:Slip 1 to cable needle and hold to back, K2, P1 from cable needle.

I'm asking for help on KnittingHelp now.... LOL