What can you not take with blexten?

Excuse me, but could you elaborate on the concept of "blexten" and its limitations? Are you referring to a specific platform, service, or technology in the cryptocurrency or finance realm? Assuming "blexten" is a hypothetical entity or service, what are the items or transactions that are not permissible or cannot be taken with or through it? For instance, does it prohibit certain types of assets, transactions involving illegal activities, or does it have geographical restrictions? Clarifying these points would help me better understand the question and provide an accurate answer.