diff --git a/README.md b/README.md
index eefd222..88d3e71 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,6 @@ classDiagram
         + abstract void write(Address address, Word data)
         + abstract void dump()
     }
-    class Program
     class ProgramCounter {
         - int PC
         - int SysTick
@@ -29,6 +28,7 @@ classDiagram
         + boolean halted()
         + void halt()
     }
+    class Program
     class Instruction {
         + abstract void execute(Memory memory, ProgramCounter pc)
         # abstract String opcode()
@@ -62,67 +62,14 @@ classDiagram
         + String toString()
         + boolean equals(Object other)
     }
-    class Add {
-        - Address src
-        - Word imm
-        - Address dest
-        + Add(Address src, Word imm, Address dest)
-        + void execute(Memory memory, ProgramCounter PC)
-        + String opcode()
-        + Object[] operands()
-        + String toString()
-    }
-    class Copy {
-        - Word imm
-        - Address dest
-        + Copy(Word imm, Address dest)
-        + void execute(Memory memory, ProgramCounter PC)
-        + String opcode()
-        + Object[] operands()
-        + String toString()
-    }
-    class Halt {
-        + Halt()
-        + void execute(Memory memory, ProgramCounter PC)
-        + String opcode()
-        + Object[] operands()
-        + String toString()
-    }
-    class Jump {
-        - int index
-        + Jump(int index)
-        + void execute(Memory memory, ProgramCounter PC)
-        + String opcode()
-        + Object[] operands()
-        + String toString()
-    }
-    class JumpEq {
-        - int index
-        - Address src
-        - Word imm
-        + JumpEq(int index, Address src, Word imm)
-        + void execute(Memory memory, ProgramCounter PC)
-        + String opcode()
-        + Object[] operands()
-        + String toString()
-    }
-    class Mul {
-        - Address src1
-        - Address src2
-        - Address dest
-        + Mul(Address src1, Address src2, Address dest)
-        + void execute(Memory memory, ProgramCounter PC)
-        + String opcode()
-        + Object[] operands()
-        + String toString()
-    }
-    class Print {
-        - Address address
-        + Print(Address address)
-        + void execute(Memory memory, ProgramCounter PC)
-        + String opcode()
-        + Object[] operands()
-        + String toString()
+    class LongMemory {
+        - long[] memory
+        + LongMemory()
+        + LongMemory(int size)
+        + Word read(Address address)
+        + int size()
+        + void write(Address address, Word data)
+        + void dump()
     }
     Memory <|-- LongMemory
     Word <|-- LongWord
@@ -132,38 +79,4 @@ classDiagram
     Computer --> Memory
     Computer --> Program
     Computer --> ProgramCounter
-    ProgramCounter --> Program
-    ProgramCounter --> Instruction
-    ProgramCounter : +toString()
-    Instruction : +toString()
-    Instruction <|-- Add
-    Instruction <|-- Copy
-    Instruction <|-- Halt
-    Instruction <|-- Jump
-    Instruction <|-- JumpEq
-    Instruction <|-- Mul
-    Instruction <|-- Print
-    Add --> Address
-```
-
-```mermaid
-sequenceDiagram
-participant Computer
-participant Program
-participant Memory
-participant ProgramCounter
-participant Instruction
-
-Computer -> Program: load(program)
-loop Program Execution
-    Program -> Computer: run()
-    loop Instructions Execution
-        Computer -> ProgramCounter: incPC()
-        ProgramCounter -> Program: getPC()
-        Program -> Program: executeInstruction()
-        Program -> Instruction: execute(memory, PC)
-        Instruction -> Memory: read/write(address)
-        Program -> ProgramCounter: incPC()
-    end
-end
 ```