7421 Dual 4-input AND gate
==========================

     14 13  12  11  10  9   8
.---|---|---|---|---|---|---|---.
|   Vcc 2d  2c  NC  2b  2a  2y  |
)                               |
|   1a  1b  NC  1c  1d  1y  Gnd |
'---|---|---|---|---|---|---|---'
    1   2   3   4   5   6   7

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