Modifiers matching protocol:

• complicated,
• outdated,
• reliable,
• common,
• old,
• traditional,
• secure,
• basic,
• layer,
• underlying,
• complex,
• electronic,
• simple,
• major,
• medical,
• external,
• open,
• modern,
• level,
• current,
• individual,
• active,
• streaming,
• key,
• popular,
• available,
• useful,
• standard,
• secondary,
• wan,

Simple categories matching outdated:

• protocol,
• appliance,
• medication,