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Try to figure out this next line:

Lab_A(config)#access-list 10 deny 172.16.16.0 0.0.3.255
The preceding configuration tells the router to start at network 172.16.16.0 and use a block
size of 4. The range would then be 172.16.16.0 through 172.16.19.0.
The following example shows an access list starting at 172.16.16.0 and going up a block size
of 8 to 172.16.23.0.
Lab_A(config)#access-list 10 deny 172.16.16.0 0.0.7.255
The next example starts at network 172.16.32.0 and goes up a block size of 32 to
172.16.63.0.
Lab_A(config)#access-list 10 deny 172.16.32.0
0.0.31.255
The last example starts at network 172.16.64.0 and goes up a block size of 64 to
172.16.127.0.
Lab_A(config)#access-list 10 deny 172.16.64.0
0.0.63.255