$p = new RepositoryPermission("/reports/samples/AllAccounts", "user:/organization_1/joeuser", 1);
$p2 = new RepositoryPermission("/reports/samples/AllAccounts", "user:/organization_1/otheruser", 32);
$c->permissionService()->createRepositoryPermissions(array($p, $p2));

// Likewise, you can create a single permission using the non-plural version

$c->permissionService()->createRepositoryPermission($p);