<Multi_key> <s> <u> : "∑" U2211 # N-ARY SUMMATION
<Multi_key> <a> <l> : "∀" U2200 # FOR ALL
<Multi_key> <e> <x> : "∃" U2201 # THERE EXISTS
<Multi_key> <l> <a> : "λ" # SMALL GREEK LETTER LAMBDA
<Multi_key> <d> <e> : "Δ" # CAPITAL GREEK LETTER DELTA