diff --git a/src/backend.rs b/src/backend.rs
index 08d3163..b8150a9 100644
--- a/src/backend.rs
+++ b/src/backend.rs
@@ -67,6 +67,13 @@ impl<'a> Vm {
 				self.stack.push(0);
 			    }
 			},
+			"<>" => {
+			    if unwrap!() != unwrap!() {
+				self.stack.push(1);
+			    } else {
+				self.stack.push(0)
+			    }
+			}
 			"MOD"|"mod" => {
 			    let stack_top = unwrap!();
 			    let stack_second = unwrap!();
@@ -106,6 +113,9 @@ impl<'a> Vm {
 			    self.stack.push(stack_top);
 			    self.stack.push(stack_second);
 			},
+			"DROP"|"drop" => {
+			    let _ = self.stack.pop();
+			},
 			"HERE"|"here" => {
 			    self.stack.push(self.dictionary.dp);
 			},