计出万全

Explanation: MASS: very safe and thoughtful. Well-described scheme is very reliable, never an accident. 　　Usage: Verb-object type; as object; means foolproof plan 　　Source: Yuan Liang Dai, "On the Sun loudly": "Wuji this life, this is foolproof carry out the terms." 　　Examples: But this kind of thing, its potential has been forced not to ~. (Qing Liu E, "Travels" sixteenth back) Thesaurus:  bag of tricks, Panacea