$d-1$

$\cdots$

k

$\cdots$

1

0

A

$b-c/d$

$\cdots$

$b-c/\left(k+1\right)$

$\cdots$

$b-c/2$

$b-c$

B

$b-\Delta \left(i\right)\beta$

$\cdots$

$b-\Delta \left(i\right)\beta$

$\cdots$

$b-\Delta \left(i\right)\beta$

$-\Delta \left(i\right)\beta$