etc/x/xcompose

include "%L"

<Multi_key> <g> <a> : "α"
<Multi_key> <g> <b> : "β"
<Multi_key> <g> <g> : "γ"
<Multi_key> <g> <p> : "π"
<Multi_key> <g> <f> : "φ"
<Multi_key> <g> <d> : "∆"

<Multi_key> <m> <a> : "▲"
<Multi_key> <m> <e> : "∎"