----         here bite
    ---     ---     ---     ---     ---     ---     ---     --- 
___|   |___|   |___|   |___|   |___|   |___|   |___|   |___|

but due to the nalog nature of a clock another oscillator interfer and you get
    ---     ---      --     ---     ---     ---     ---     --- 
___|   |___|   |____|  |___|   |___|   |___|   |___|   |___|