Hi,
I followed the attached diagram, the datasheet of 74HC137, to create a 6-to-64 decoder,

But I have a doubt:

The pin shown in the arrow, always connected to the STROBE signal?

http://obrazki.elektroda.pl/5079304200_1501508499.jpg

 

Yes, it looks like a missing connection dot to me.

 

Since the top device has Strobe connected to E2, my guess is that the bottom E2's go to the Strobe signal also.