.... + a=1+2+4+8+16+32
....+2a=2+4+8+16+32+64
.....+2a+1=1+2+4+8+16+32
2a+1=a
a= -1
:
.... + a=1+2+4+8+16+32
....+2a=2+4+8+16+32+64
.....+2a+1=1+2+4+8+16+32
2a+1=a
a= -1
:
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