$1.$ With Toronto, Vancouver and Miami were used as three transshipment centers, draw the network diagram $($hand drawing is

acceptable for this question, please make it clearly and insert the network diagram in your report$).$

$2.$ With Toronto, Vancouver and Miami were used as three transshipment centers, develop a concept model for the problem and then

clearly present Table $1$ below.

Table $1$: Conceptual model $($handwriting is NOT acceptable$)$

Conceptual model

Decision Variables

$($clearly define

decision variables$)$

Objective function

$($clearly show the links

with decision

variables$)$