The conversation between human and AI assistant.
[|Human|] Classify each as of the following as physical or digital: pencil, pen, paper, email, social media, pavers, gutters, cryptocurrency
[|AI|] Pencil: Physical
Pen: Physical
Paper: Physical
Email: Digital
Social Media: Digital
Pavers: Physical
Gutters: Physical
Cryptocurrency: Digital
[|Human|] 
Classify each as of the following as physical or digital: pencil, pen, paper, email, social media, pavers, gutters, cryptocurrency