I found that if there are more than two elses that are not used, an error will be reported.

[mryao199]

vi test.txt
mode: test
zoom: zoom1,zoom2,zoom3,zoom4
IF [water] IN {"water1", "water2"}
THEN [water_a] = "NA"
ELSE [water_m] <> "NAm";
IF [action] = "action1" OR [action] = "action2"
THEN [high_i] = "NAi"
ELSE [high_e] <> "NAe";
wq
pict.exe test.txt
error info
Constraints Warning: Constraint IF [water] IN {"water1", "water2"}THEN [water_a] = "NA" ELSE [water_m] <> "NAm"; contains unknown parameter. Skipping...
Constraints Warning: Constraint IF [action] = "action1" OR [action] = "action2"THEN [high_i] = "NAi" ELSE [high_e] <> "NAe"; contains unknown parameter. Skipping...
Constraints Warning: Constraint ; contains unknown parameter. Skipping...

I found that if there are more than two elses that are not used, an error will be reported.