Calculate CLC BV for conditional permutations

## Usage

`jc_clc_perm_impl(x, z, listw, index)`

## Arguments

- x
a binary variable consisting of 1 and 0, or `TRUE`

and `FALSE`

.

- z
a binary variable consisting of 1 and 0, or `TRUE`

and `FALSE`

.

- listw
a `listw`

object

- index
an integer vector identifying positions to subset.