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Hard level:
Place three NOD32 lv.2
-----AGB
|NN
|N
|
Then 4 AVG(lv up to 3)
|
K'|AA' (save$2000 to lv up A' at once)
K |AA
- - -
Before all AVG goes to lv3,got 1 kaper to lv.4:
After all AVG lv3,got another Kaper K' to lv.4 if enough