Ok to study 6th edition?

[Yoda]

Yoda did not learn from the 7th. Or 6th. I believe it was the 5th.

Actually, my 'first' was the 4th. It was signed:

Lynn,

May you rise higher and higher in its boundless basics. Sustain the Lag.

Ben
'79

Over the years, the bookend editions of '1, 2 and 3' and '5, 6 and 7' completed my library. And added to the fun. True afficienados must have them all.

Read every written word.

Listen to every recorded word.

There is no substitute.