D. - diffrence.  it is very very hard to know

                        or although you know it, you can't know

I.  - irregularity.  it is very very hard to react.

                           we never know what is able to happen.

F. - far    the gap between she and he

F. - friend we may don't care for friends, so we lose friends

C. - compete we did'nt think about each other,

                    just think about myself.

U. - useless It's possible we are useless each other.

L. - love  but, love makes us happy, perfect, useful,friendly,same

T. - true  Now we must up-front with lover.