2-decade up/down BCD counter ,, need help

Looking beyond your homework laziness for a moment - the quality of this class material is poor. Asking pupils for a state diagram for this counter is fairly pointless, since it's got only the obvious ~100 internal states. On a ten by ten grid it's not so bad to draw out the Up/Down transitions, but the Load input jumps you to any state, from any state (depending on the 8 Load data pins) so that will cover the diagram in possible transitions. No mention of the clock input anywhere. No mention of what stimulus is required for the timing diagrams (how many cycles of the four examples?). Good luck.