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PORTB = 0b11111110; // assigning a value to PORTB unconditionally
PORTB &=0b11111110; // reading PORTB and MASKING OUT the LSB bit ONLY
PORTB = PORTB & 0xFE; // same statement written differently
PORTB &= (1<<PB0); // isn't correct if it should be the same as the previous...
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