Which elements will be JOin Irreducible in D60 ?Compilements of 2 and 10 exists?

Question

Which elements will be JOin Irreducible in D60 ?

Whether complements of 2 and 10 exists or not? 

Express each number  x as join of a minimum number of irredundant join irreducible elements.

Comments

now please tell 

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i have drawn the lattice now please tell how to find  

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Now please tell how to :

check  A)Whether complements of 2 and 10 exists or not? 

B) Which elements will be JOin Irreducible in D60 ?

C)Express each number  x as join of a minimum number of irredundant join irreducible elements.