We would like to really understand what happens when we use quick fill.

A$.$ Let's consider the entries $=A1,=$$$A1,=A$$$1,$ and $=$$$A$$$1$ in row $2.$ Do quick fill below to fill in $3$ more rows and see what happens. Clearly in the first row these cells all now point to cell A$1$ and the value returned is $1.$ After the first row we get a mixture of values. Why?

$\backslash$table$[[+,$A$,$B$,$C$,$D$,$E$,$F$,$G$],[1,1,2,=A1,=$$$A1,=A$$$1,=$ SAS$1,],[2,3,4,1,1,1,1,],[3,5,6,,,,,],[4,,,,,,,]]$