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i have two bit numbers (x1 x0 ,y1 y0) which are needed to be subtructed

i can't understand why

x1 x0 y1 y0 | B D1 D2

0 0 0 1 | 1 1 0

0 0 1 0 | 1 0 1

0 0 1 1 | X X X

i can't understand these arithmetics

the first one is 0-1=-1

so in base 3 the resolt is should be three but i can't understand what meen Borrow=1

and the resolt 10

i don't understand how did they desided that

and why we have don't cares on the third example