If statement's multiple layers problem ('and' and 'or')?

I find this really annoying, these are code that make everything in the character go transparent but the right arm parts, but it just makes the whole character goes transparent. For example, if I type like this:

if v:IsA("BasePart") and (v.Name ~= 'RightHand' or v.Name ~= 'RightUpperArm' or v.Name ~= 'RightLowerArm')  then

or this:

if v:IsA("BasePart") and ((v.Name ~= 'RightHand') or (v.Name ~= 'RightUpperArm') or (v.Name ~= 'RightLowerArm'))  then

or even this:

if v:IsA("BasePart") and ((not v.Name == 'RightHand') or (not v.Name == 'RightUpperArm') or (not v.Name == 'RightLowerArm'))  then

or even this one:

if v:IsA("BasePart") and (not (\v.Name == 'RightHand') or not (v.Name == 'RightUpperArm') or not (v.Name == 'RightLowerArm'))  then

All of those still makes the entire character disappear, if you are an expert about these if statement stuff then please let me know how to do it.

if v:IsA("MeshPart") then
	if v.Name == "RightLowerArm" or if v.Name = "RightHand" or if v.Name = "RightLowerArm" then return end
end