let k, l be Element of NAT ; for e being Element of vSUB holds [<*[k,l]*>,e] in [:([:NAT,NAT:] *),vSUB:]
let e be Element of vSUB ; [<*[k,l]*>,e] in [:([:NAT,NAT:] *),vSUB:]
<*[k,l]*> in [:NAT,NAT:] *
by FINSEQ_1:def 11;
hence
[<*[k,l]*>,e] in [:([:NAT,NAT:] *),vSUB:]
by ZFMISC_1:def 2; verum