following this reference [example](https://github.com/cmdruid/tapscript/blob/master/test/example/taproot/tapscript.test.ts#L20) , can you provide an example for this 2-2 simple script <pk_1> OP_CHECKSIGVERIFY <pk_2> OP_CHECKSIG
following this reference example , can you provide an example for this 2-2 simple script <pk_1> OP_CHECKSIGVERIFY <pk_2> OP_CHECKSIG