Combining NAT port forward rules

Installing and Using OpenWrt Network and Wireless Configuration
1

Hi,
is it possible to combine the follwing 3 NAT port forward rules in a single rule?

config nat
        option name 'LAN: Redirect HTTP traffic to proxy'
        list proto 'tcp'
        option src_port '80'
        option dest_ip '!10.0.0.0/8'
        option dest_port '80'
        option target 'SNAT'
        option snat_ip '172.21.10.10'
        option src 'lan'

config nat
        option name 'LAN: Redirect HTTP traffic to proxy'
        list proto 'tcp'
        option src_port '80'
        option dest_ip '!172.16.0.0/12'
        option dest_port '80'
        option target 'SNAT'
        option snat_ip '172.21.10.10'
        option src 'lan'

config nat
        option name 'LAN: Redirect HTTP traffic to proxy'
        list proto 'tcp'
        option src_port '80'
        option dest_ip '!192.168.0.0/16'
        option dest_port '80'
        option target 'SNAT'
        option snat_ip '172.21.10.10'
        option src 'lan'