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lib/terminal_ui.rb

@@ -10,6 +10,11 @@ class TerminalUI
     print "Choose a card: "
     choice = gets.chomp.to_i
 
+    until choice.between?(1, player.hand.length)
+      print "Invalid choice. Choose a card: "
+      choice = gets.chomp.to_i
+    end
+
     player.hand[choice - 1]
   end