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#wolf #whistle #hctip #high low #up down #catcall

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#digital signal #on off #high low #logic level #square toggle #alternating state #square pulse sequence

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#square wave #digital signal #waveform #oscilloscope #high low #periodic signal

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#square wave #waveform #level shift #high low #digital signal #signal transition #on off

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#hguort #up down #high low #top bottom #fluctuation #oscillation

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#high low #hi lo #card game #guessing game #higher lower #number game

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#high low #hi lo #card game #guessing game #higher lower

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#rollercoaster #high low #rise fall #up-and-down arrow

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#majority #minority #high low

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#square wave #discrete signal #digital waveform #high low #signal transmission

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#high low #up down arrows #vertical comparison #tall short symbol #abstract height #level difference

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#level change #high low