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Dx+Di=1 Dx+Di>1 Dx+Di<1 Dx-Di>1
PUSH SI PUSH SI PUSH DI PUSH DI POP SI POP DI POP DI POP SI MOV AX，SI MOV AX，SI MOV SI，AX MOV BX，DI MOV DI，BX XCHG BX，AX
LEA AX,20[DI] MOV AX,OFFSET DI MOV AX,20[DI] LEA AX[DI]
Thats, swim It, to swim This, swimming Its, to swim
都为1 都为0 DI22=1；DI26=0 DI22=0；DI26=1
PUSH SI PUSH DI POP SI POP DI PUSH SI PUSH DI POP DI POP SI MOV AX，SI MOV SI，AX MOV DI，BX MOVAX，SI MOV BX，DI XCHG BX，AX
LEAAX，20[DI] MOVAX，OFFSET DI MOV AX, 20[DI] LEA AX， [DI]
SI+SI+1，DI=DI+1 SI=SI+2，DI=DI+2 SI=SI-1，DI=DI-1 SI=SI-2，DI=DI–212.
PUSH SI PUSH DI POP SI POP DI PUSH SI PUSH DI， POP SI，DI MOV AX，SI MOV SI，DI MOV DI，AX MOVAX，SI MOV BX，DI XCHG BX，AX
（SI）=0FEH，（DI）=1FEH （SI）=100H，（DI）=202H （SI）=100H，（DI）=1FFH （SI）=100H，（DI）=1FEH
Because they cannot catch a whale tot study because of its great strength. Because whales are too dangerous to get close to. Because they can’t bring a whale alive into the laboratory for study. Because no scientists are interested in the subject.
Dx+Di=1 Dx+Di>1 Dx+Di<1 Dx-Di>1
di1=1 di2=1 di1=1,di2=0 di1=1,di2=1
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