Consider the following sequences of 1s and 0s

1. An alternating sequence of 1s and 0s [1 0 1 0 1 0 1 0].
2. A long sequence of Is followed by a long sequence of 0s [1 1 1 1 0 0 0 0].
3. A long sequence of 1s followed by a single 0, then a long sequence of 1s [1 1 1 0 1 1 1 1].

Sketch the waveform for each of these sequences using the following methods of representing symbols 1 and 0:

a. On-Off signals.
b. Bipolar Return-to-Zero signaling.