Let's say in 1912 germany proposed to italy to replace its coal imports from gb on a national contract. German coal expands to italy. When ff is killed germany gives a conditional blank check to ah that they turn over land to italy and if they win then this turnover will be modified with conquests.
Italy has its coal sources, and land so it joins cp.
1 per sch plan a large Italian army moves up to al freeing 1german army to move to the german right
2 additional itialian army is used on Serbian attack, freeing ah forces for russia