# Understanding 2's complement multiplication using Booth's algorithm

I was referring Booth's algorithm for 2's complement multiplication from William Stallings book. It was explained as follows (please ignore two starting words "As before", it still makes complete sense):

The author then gives following example for $7\times 3$, which I am able to understand:

Next author gives examples for all combinations of +ve and -ve combination of multiplication:

Doubt

I am not able to get how example in figure 9.13 maps to same example but more compact approach illustrated in figure 9.14(a). I mean how those entries are made in fig 9.14 (a)

PS: Wanted to add tags "booths-algorithm" and "2s-complement-multiplication", but wasnt able to create those due to low reputations.