The below image displays frequently occurring sequences for the hero Witch Slayer in HoN, based on 100,000 item and ability usage events. Click the image to get an enlarged version.
The most commonly occurring 3-sequence is:
ABILITY_ACTIVATE Ability_WitchSlayer1->ABILITY_ACTIVATE Ability_WitchSlayer2->ABILITY_ACTIVATE Ability_WitchSlayer4
(sup:930 conf:0.14689623 lift:2.4264326)
Some other sequences of interest:
ITEM_ACTIVATE Item_EnhancedMarchers->ABILITY_ACTIVATE Ability_WitchSlayer2->ABILITY_ACTIVATE Ability_WitchSlayer4
(sup:148 conf:0.19892474 lift:3.2858396)
ITEM_ACTIVATE Item_Bottle->ITEM_ACTIVATE Item_Bottle->ITEM_ACTIVATE Item_Bottle
(sup:582 conf:0.42327273 lift:12.91253)
The sequences seen in the top right corner are sequences of different length, all of the type:
ITEM_ACTIVATE Item_RunesOfTheBlight -> ITEM_ACTIVATE Item_RunesOfTheBlight -> ...

Very interesting work Emil! Isaac.
SvarSlet