How connect 3 routerboard

I need help for connecting this 3 routerboard and need to work internet on any hotspot clients on Router1,Router2,Router3, what is the best way, the routing or bridge, the hotspots is work perfect but, and Router3 work internet, Router2 and Router1 not. Thanks Robert


Router1 (RB532A)

wlan1
ip: 20.0.0.1/24
note: hotspot for clients

wlan2
ip: 50.0.0.1/24
note: wirelles link to Router2


Router2 (RB532A)
wlan1
ip: 20.1.0.1/24
note: hotspot for clients

wlan2
ip: 50.0.0.2/24
note: wirelles link to Router1

wlan3
ip: 50.0.1.1/24
note: wirelles link to Router3


Router3 (RB532A)
wlan1
ip: 20.2.0.1/24
note: hotspot for clients

wlan2
ip: 50.0.1.2/24
note: wirelles link to Router2

wlan3
ip: x.y.z.15/24
note: wirelles link to the WAN