diff --git a/material/cards_04.json b/material/cards_04.json
index 149e501..b0d1804 100644
--- a/material/cards_04.json
+++ b/material/cards_04.json
@@ -1,30 +1,26 @@
 [
     {
-        "front": "Linear dependence and Independence of vector",
+        "front": "What does Linear dependence and Independence of vectors imply? ",
         "back": "Discuss"
     },
     {
-        "front": "Computational complexity of Quantum system's simulation.",
+        "front": "How is the Computational complexity of Quantum system's simulation on a classical system connected to the size of the quantum system.",
         "back": "The growing size of the Hilbert space prohibits computation."  
     },
     {
-        "front": "Thoughts on Operators as observation and states as abstract vectors",
+        "front": "Is the connection between states represented as vectors and operators represented as matrices clear?",
         "back": "Discuss"
     },
     {
-        "front": "Mathematical interpretation of Quantum measurement.",
+        "front": "What is the mathematical implication of the measurement of the quantum state, what happens to the vector when measured in a basis?",
         "back": "Discuss"
     },
     {
-        "front": "Combining Quantum systems. Multiple Qubits.",
+        "front": "How do you combine the hilbert space created by multople qubits, how do the vectors change and how do the operators change?",
         "back": "How does the bigger system looks like, and how it changes the scale of the problem."
     },
     {
-        "front": "No-cloning theorem",
+        "front": "Mathematical connection to derive no-cloning theorem",
         "back": "Discuss"
-    },
-    {
-        "front": "Do you have any mental health concerns, after this lecture?",
-        "back": " We are here to support :-) "
     }
 ]
\ No newline at end of file