also what exactly is $PDK in this command line ```$PDK_ROOT/$PDK/config.tcl``` since my $pdk_root c...
i
also what exactly is $PDK in this command line
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$PDK_ROOT/$PDK/config.tcl
since my $pdk_root consists of three directories open_pdk, sky 130A and skywater-pdk
a
$PDK is sky130A