LD/ld: Load Doubleword DS-form:
ld REGA, 0(REGB)
use the contents of REGB as the memory address of the value to load into REGA
LBZ/lbz: Load Byte and Zero D-form:
LHZ/lhz: Load Half Land Zero D-form,
LWZ/lwz: Load Word and Zero D-form
all of these follow the same format, but operate on bytes, halfwords, and words, respectively (the "z" indicates that they also zero-out the rest of the register)
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