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Common shorthand notation for a sequence of bits is Q[3:0].
The rightmost bit is written as bit[0].
For n bit-sized register the leftmost bit is written as bit[n-1].
A subunit of a register is called a field, written as Q[l:r], specifying (left:right) bit range.
In our course we always assume that bit numbering goes from right to left, starting with zero.
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