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[802.3BA] query regarding Alignment markers transmission


I am reading following clauses of 802.3ba draft 2.0:

Paragraph 1 of 82.2.8 :
"The alignment markers are inserted after every 16383 66-bit blocks on each lane"

Paragraph 2  of 82.2.9 :
"Each bit in the BIP field is an even parity calculation over all of the previous selected bits of a
given PCS Lane, from and including the previous alignment marker, but not including the current alignment

I am not clear that when should the Alignment markers be sent for the first time? That is, should
they be sent at very beginning or after transmisting initial 16383 66-bit blocks. In both cases, how should BIP field calculation
be done for the first time?

Any clarifications on this would be greatly helpful.