You can do that. What you need:
- NAT Exemption for your whole VPN-traffic where needed
- same-security-traffic permit intra-interface
- ASA3 needs to route traffic for the internal ASA4-subnet and the ASA1 subnet through the tunnel
- ASA1/ASAv need to encrypt all traffic for ASA1-ASAv-subnet and ASA1-ASA3-subnet
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