Apply CD_minus_add with
Sing 3,
CSNo,
minus_CSNo,
add_CSNo leaving 4 subgoals.
The subproof is completed by applying quaternion_tag_fresh.
The subproof is completed by applying CSNo_minus_CSNo.
The subproof is completed by applying CSNo_add_CSNo.
The subproof is completed by applying minus_add_CSNo.