Product Costyle, version 1.0
Found bug: on the smooth surface, the shell slides, which is why sick people often fall
Resolved in version 1.1: a long shaft with counterweights is added so that the inertia does not allow the user to fall quickly.
Discovered bug: long six clinging to buildings and passers
Resolved in version 1.2: warning signs and sound alarms are added at the end of the six.
Found bug: due to the increased weight of the shell is difficult to move sick people
Resolved in version 1.3: added wheel with pedals
Discovered bug: single-legged people can not spin pedals
Resolved in version 1.4: extra pedal removed.