ghost

turtlebot: 3
rvis: 2
ROS: 2
slope: 1
rqt: 1
catkin: 1
flat: 1
color: 1
graph: 1
disadvantages: 1
mapping: 1
gmapping: 1
better: 1
Interesting: 1
program: 1
advantages: 1
error: 1
maze: 1
line: 1
tutorial: 1