Convert the below C code snippet to LEGv$8$ assembly code. Assume variables a$,$ b$,$ and c are stored in registers X$20,$ X$21,$ and X$22$ respectively. The base address of array d is stored in register X$19.$ Do not use multiply and divide instruction. Comment your assembly code.

a $=$ b $+$ c; d$[2]=$ a $-$ d$[1]$; d$[$a$]=$ b $+$ d$[3]$;

d$[$a$/4]=$ a $-$ d$[4*$b$]$;