access-list 10 permit ip 192.168.146.0 0.0.1.255>>> means that it allow ip from .146 to .147 since it used the 0.0.1.255, the .1 on 3rd octet of the wildcard mask, 255-1 = 254 (meaning increment of 2), and on the 4th octet 255 means any,so it allow network 192.168.146.0 and 192.168.147.0. I hope you understand it. It is really hard for me to explain