# subset?
Check if the first set is a subset of the second.
## Syntax
[subset? $set1 $set2]
## Examples
[subset? ^{ 1 2 } ^{ 1 2 3 }] # true
[subset? ^{ 1 4 } ^{ 1 2 3 }] # false
## Returns
Boolean.
## See Also
`union`, `intersection`, `difference`, `in?`