0 a small lock that is opened using a set of numbers or letters put in a particular order, usually by turning wheels with numbers on them or by pressing keys: --
The briefcase had a combination lock.
Evidence is kept behind a steel door secured by a combination lock.
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
Можем да го завършим стъпка по стъпка, колкото и дълъг да е пътят и не може да бъде завършен, колкото и кратък да е пътят, ако дори не маркирате отпечатъка си.