16th

There are all kinds of bonds between people...

Some are tough but short bonds, bound to break with distance,

Elastic bonds that'll always bring you back to each other,

Metallic bonds, rigid and suffocating,

Bridge bonds, always depending on the presence of a third person or a group,

Broken bonds, that you carry the weight of despite the separation,

Highly flammable bonds, invisible bonds, spring wire bonds...