$i$	Index of suppliers $i\in I=\{1,2,...,i\},$
$m$	Index of producer (manufacturers)$m\in M=\{1,2,...,\overline{m}\},$
$d$	Index of Distributing Centers (DC)$d\in D=\{1,2,...,\overline{d}\},$
$r$	Index of retailers $r\in R=\{1,2,...,\overline{r}\},$
$u$	Index of collection centers $u\in U=\{1,2,...,\overline{u}\},$
$k$	Index of repairing centers $k\in K=\{1,2,...,\overline{k}\},$
$e$	Index of disposal centers $e\in E=\{1,2,...,\overline{e}\},$
$v$	Index of second customers $v\in V=\{1,2,...,\overline{v}\},$
$p$	Index of commodity (products)$p\in P=\{1,2,...,\overline{p}\},$
$t$	Index of time period $t\in T=\{1,2,...,\overline{t}\},$
$s$	Index of scenario $s\in S=\{1,2,...,\overline{s}\}.$