# 017: Sets
# Unique collections (no duplicates)

# Create a set
tags = {"javascript", "python", "rust"}

# Add items
tags.add("go")
tags.add("python")  # Already exists, won't duplicate

show tags  # {"javascript", "python", "rust", "go"}

# Check membership
has_rust = tags.contains("rust")
show "Knows Rust: {has_rust}"

# Remove item
tags.remove("javascript")
show tags

# Set size
show "Number of languages: {tags.size}"
