1.   A tall wooden tripod is set up on the frozen river and attached by wire to a switch on a clock on the river bank.

2.   Moreover, wheels could be moved around and wires attached in different ways, enormously increasing the coding possibilities.

3.   No wires attached.

4.   Police said a trip wire attached to the front door and the grenade had triggered the blast.

5.   In addition to its famous metro, the system includes trams and the trolley system of buses attached by wires to electric lines.

6.   In addition to the subway, the system includes buses, trams and trolleybuses, which are attached by wires to electric lines.