Question: How many stalls cycles without forwarding in a MIPS pipepline are required for the following MIP instruction? How many stall are there with forwarding included

How many stalls cycles without forwarding in a MIPS pipepline are required for the following MIP instruction?
How many stall are there with forwarding included in the pipeline??
add $R2, $R0, $R0
lw $R1,0($R2)
addi $R3, $R1,20
add $R1, $R2, $R0
or $R1, $R2, $R0
Can you explain both using pipeline building blocks?

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