I would argue that the flaw is in 5: the block of iron at this stage is not the same as it was when statement 2 was made. Other example: 1. Ice is a solid 2.

I would argue that the flaw is in 5: the block of iron at this stage is not the same as it was when statement 2 was made. Other example: 1. Ice is a solid 2. There exists a “sun” function that maps the atoms of ice into the atoms of water. 3. Water is a liquid 4. Statement (3) contradicts statement (1).