Write a parallel sentence (4 sentences) about sadness in verse.

Sadness is like Liu Yuxi's "bonus is easy to decline like lang yi, water is infinite like sorrow"; Sadness, such as Zhang Ji's "tears return your beads, and I hate not being married and not meeting you"; Sorrow is like Cao Zhi's "If you raise the dust on the road and make the cement muddy, when can we meet in harmony?" Sadness is like Nalan Xingde's "desolation and parting should be the same, and it is the most difficult to clear up grievances between months."