Draw network with specified dummies

A question is this type if and only if it asks you to draw an activity network using exactly a specified number of dummies (e.g., exactly two dummies).

2 questions · Moderate -0.3

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Edexcel D1 2016 June Q2
5 marks Moderate -0.3
2. Draw the activity network described in the precedence table below, using activity on arc and exactly three dummies.
ActivityImmediately preceding activities
A-
B-
CA
DA
EB
FB
GA, E, F
HF
IC
JD, G
KD, G
Edexcel D1 2005 January Q2
7 marks Moderate -0.3
The precedence table for activities involved in producing a computer game is shown below.
ActivityMust be preceded by
\(A\)\(-\)
\(B\)\(A\)
\(C\)\(B\)
\(D\)\(A, C\)
\(E\)\(A\)
\(F\)\(E\)
\(G\)\(E\)
\(H\)\(G\)
\(I\)\(D, F\)
\(J\)\(G, I\)
\(K\)\(G, I\)
\(L\)\(H, K\)
An activity on arc network is to be drawn to model this production process.
  1. Explain why it is necessary to use at least two dummies when drawing the activity network. [2]
  2. Draw the activity network using exactly two dummies. [5]