func NewCardCollection() *CardCollection {
	return &CardCollection{
		col: make(map[string]struct{}),
	}
}
// NewCardCollection returns a new, empty CardCollection.
NewCardCollection returns a new, empty CardCollection.
// NewCardCollection returns a new empty CardCollection .
func NewCardCollection() *CardCollection {
	return &CardCollection{
		col: make(map[string]struct{}),
	}
}
func NewCardCollection ( ) * CardCollection { return & CardCollection { col : make ( map [ string ] struct { } ) , } }
NewCardCollection returns a new, empty CardCollection.
NewCardCollection returns a new empty CardCollection .