Based on the information provided in the extracts, you can define the namespaces and permissions in the Ory Permission Language (OPL) as follows:

typescript import { Namespace, Context } from "@ory/keto-namespace-types"    class User implements Namespace {}    class Group implements Namespace {    related: {    members: User[]    }   }    class Merchant implements Namespace {    related: {    systemAdmins: Group[]    }     permits = {    createMerchant: (ctx: Context): boolean => this.related.systemAdmins.includes(ctx.subject),    }   }

In this code, we have defined three namespaces:

User

,

Group

, and

Merchant

. The

Group

namespace has a relationship

members

which is an array of

User

. The

Merchant

namespace has a relationship

systemAdmins

which is an array of

Group

. The

Merchant

namespace also has a

permits

property which defines the permissions for this namespace. In this case, we have a

createMerchant

permission which is a function that takes a context containing the subject and returns a boolean value indicating whether the subject has this permission. The function checks if the subject is included in the

systemAdmins

relationship of the

Merchant

namespace. Please note that this is a basic example and you might need to adjust it according to your specific requirements and the actual structure of your application. For more information on how to use the Ory Permission Language (OPL), you can refer to the [Ory Documentation](https://www.ory.sh/docs/keto/reference/ory-permission-language).