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I am interested in CPU mining on the Litecoin testnet (testnet4); the difficulty level is currently low enough to make this feasible.

The standard Litecoin client no longer supports CPU mining. The only scrypt CPU miner I'm currently aware of is Pooler's cpuminer. However, Litecoin testnet4 has gone to segregated witness, which requires miner client support, and cpuminer doesn't support segwit.

Is there any other CPU mining software that supports this?