chloride(in) + Na(+)(in) => chloride(out) + Na(+)(out)
chloride(in) + na(+)(in) => chloride(out) + na(+)(out)
chloride(in) + Na(+)(in) => chloride(out) + Na(+)(out)
chloride(in) + na(+)(in) => chloride(out) + na(+)(out)