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74LS20SCX74LS221DR74LS219AN74LS221FP
74LS195AP74LS195AN74LS196DR74LS20DR2
74LS20MX74LS20DR74LS20PC74LS20RP
74LS221DR274LS221NSR74LS20RPEL74LS240DBR
SN74LS219ANSN74LS21NSRSN74LS221DRSN74LS221NS
SN74LS2000SN74LS19NSSN74LS20DRSN74LS20JD
SN74LS19ADBRSN74LS19ANSRSN74LS20DR2GSN74LS221DBR
SN74LS195ANSN74LS196DRSN74LS19ADRSN74LS20DG4
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