3 leads ecg circuit using multisim

[aria_v2000]

hi there,I found 4017.that's in cmos part,4017bp_5v but remeber to download the datasheet to know how to wire!there's a little difference in wiring between the real part and the simulation part,but i didn't find the 4521 in multisim

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hi my friend.I'm wondering how 3-lead ecg can have 4 output?!!!!!you only have 3 !