CC Command Inventory clear

function clear(...)
    assert(commands, "Require Command Computer")
    local arg = {...}
    local b, result = false, {}
    for i=1,#arg,3 do
        assert(
            arg[i] and arg[i+1] and arg[i+2],
            string.format(
                "Missing coordinate: clear(%s, %s, %s)",
                arg[i] and arg[i] or "<x>",
                arg[i+1] and arg[i+1] or "<y>",
                arg[i+2] and arg[i+2] or "<z>"
            )
        )
        local r
        b, r = commands.blockdata(arg[i], arg[i+1], arg[i+2], "{Items:[{}]}")
        table.insert(result, unpack(r))
        if not b then
            return false, #result > 0 and result or nil
        end
    end
    return b, #result > 0 and result or nil
end