Final pairings of 01100s before replacement by the recently retired #12 series

I do see a partial list of final pairing of 01100s when these cards went into work service in another post, but where these paired as such during their final revenue runs?

01106-01107
01112-01113
01120-01121
01122-01123
01144-01145
01146-01147
01160-01161
01178-01179 - Seashore
01180-01181
01182-01183

01101-01102
01103-01104
01133-01170 - ATO test car

01133-01170 and 10 other cars removed from service were: 01185, 01100, 01154, 01110, 01135, 01142, 01149, 01158, 01163 and 01171.

(Edited to add info from RTSPCC from an old post on the old ne.transportation group)

I know that the final set that ran from Everett in 1975 was 01111, 01162, 01177 and 01188, but what where the actual pairings of that set in question and if they kept these mismatched pairs to the end in 1980?

What was the final day for the 01100s? February 6, 1981 is mentioned as the debut of the 01200s, but that seems
late given the first pilot cars were built late 1979 and delivered January 1980. What was the delay in acceptance,
over a full year?

The T was in no rush to have the 01200s in service since the 01100s were only about 20 years old and were running well. It was more important to get the 0600s on the Blue into service first.

The notes I have show it as November 6, 1981 when 01101/01102, 01103/01104, 01122/01183 and 01123/01182 were withdrawn from service. On November 7th they went to a one guard (today door attendant) rendering the 01100s obsolete.